Type of Arrangement and Non-arrangement Transactions [Axis] Loan Agreement [Member] Equity Components [Axis] Common Stock [Member] Treasury Stock [Member] Paid In Capital [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) [Member] Noncontrolling Interest [Member] Award Type [Axis] Restricted Stock Unit Awards [Member] Variable Rate [Axis] LIBOR plus [Member] LIBOR plus One [Member] Prime Rate Plus [Member] Consolidated Entities [Axis] Foreign Subsidiary's [Member] Scenario [Axis] Since Inception [Member] Title of Individual [Axis] Non-Employee Directors [Member] Subsequent Event Type [Axis] Subsequent Event [Member] Legal Entity [Axis] U.S. Small Business Administration [Member] Debt Instrument [Axis] PPP Loan [Member] Range [Axis] Minimum [Member] Maximum [Member] Loss Contingency Nature [Axis] Insurance Claims [Member] Phantom Stock Plan [Member] Geographical [Axis] Middletown [Member] Houston [Member] Banbury [Member] Full Value Units [Member] Concentration Risk Benchmark [Axis] Accounts Receivable [Member] Customer [Axis] One Significant Customer [Member] Sales Revenue Net [Member] Document And Entity Information Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Flag Entity Emerging Growth Company Entity Shell Company Entity Common Stock, Shares Outstanding Document Fiscal Period Focus Document Fiscal Year Focus Statement of Financial Position [Abstract] ASSETS Current Assets: Cash and Cash Equivalents Accounts Receivable - less allowances of $1,103 and $1,433, respectively Inventories - Net Other Current Assets Total Current Assets Right-Of-Use Assets - Operating Property and Equipment - Net Goodwill - Net Deferred Taxes Other Long Term Assets Total Assets LIABILITIES AND SHAREHOLDERS' EQUITY Current Liabilities: Accounts Payable Accrued Compensation Accrued Commissions and Sales Incentives Dividends Payable Taxes Payable Lease Liability - Operating Other Liabilities Total Current Liabilities Lease Liability - Operating, net of current portion Deferred Taxes Long Term Taxes Payable Other Long Term Liabilities Total Liabilities Commitments and Contingencies (Note 5) Shareholders' Equity: Omega Flex, Inc. Shareholders' Equity: Common Stock - par value $0.01 share: authorized 20,000,000 shares: 10,153,633 shares issued and 10,094,322 outstanding at both March 31, 2020 and December 31, 2019 Treasury Stock Paid-in Capital Retained Earnings Accumulated Other Comprehensive Loss Total Omega Flex, Inc. Shareholders' Equity Noncontrolling Interest Total Shareholders' Equity Total Liabilities and Shareholders' Equity Allowance for doubtful accounts receivable Common stock, par value Common stock, shares authorized Common stock, shares issued Common stock, shares outstanding Income Statement [Abstract] Net Sales Cost of Goods Sold Gross Profit Selling Expense General and Administrative Expense Engineering Expense Operating Profit Interest Income Other Income (Loss) Income Before Income Taxes Income Tax Expense Net Income Less: Net Income attributable to the Noncontrolling Interest, Net of Tax Net Income attributable to Omega Flex, Inc. Basic and Diluted Earnings per Common Share Basic and Diluted Weighted-Average Shares Outstanding Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Net Income Other Comprehensive Income (Loss): Foreign Currency Translation Adjustment Other Comprehensive Income (Loss) Comprehensive Income Less: Comprehensive Income Attributable to the Noncontrolling Interest Total Other Comprehensive Income Statement [Table] Statement [Line Items] Balance Balance, shares Cumulative Translation Adjustment Dividends Declared Balance Balance, shares Statement of Cash Flows [Abstract] Cash Flows from Operating Activities: Adjustments to Reconcile Net Income to Net Cash Provided By (Used In) Operating Activities: Non-Cash Compensation Depreciation and Amortization Provision for Losses on Accounts Receivable, net of write-offs and recoveries Deferred Taxes Provision for Inventory Reserves Changes in Assets and Liabilities: Accounts Receivable Inventories Right-Of-Use Assets Other Assets Accounts Payable Accrued Compensation Accrued Commissions and Sales Incentives Lease Liabilities Other Liabilities Net Cash Provided By (Used In) Operating Activities Cash Flows from Investing Activities: Purchase of Investments Net Proceeds from Sale of Investments Capital Expenditures Net Cash Used in Investing Activities Cash Flows from Financing Activities: Dividends Paid Net Cash Used in Financing Activities Net Decrease in Cash and Cash Equivalents Translation effect on cash Cash and Cash Equivalents - Beginning of Period Cash and Cash Equivalents - End of Period Supplemental Disclosure of Cash Flow Information: Cash paid for Income Taxes Declared Dividend Accounting Policies [Abstract] Basis of Presentation and Description of Business Significant Accounting Policies Inventory Disclosure [Abstract] Inventories Debt Disclosure [Abstract] Line of Credit Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Share-based Payment Arrangement [Abstract] Stock Based Plans Leases [Abstract] Leases Equity [Abstract] Shareholders' Equity Related Party Transactions [Abstract] Related Party Transactions Subsequent Events [Abstract] Subsequent Events Use of Estimates Revenue Recognition Cash Equivalents Accounts Receivable and Provision for Credit Losses Investments Inventories Property and Equipment Goodwill Stock-based Compensation Plans Product Liability Reserves Leases Fair Value of Financial and Nonfinancial Instruments Earnings Per Common Share Currency Translation Income Taxes Other Comprehensive Income Significant Concentration Subsequent Events Recent Accounting Pronouncements Schedule of Inventories, Net of Reserves Summary of Nonvested Phantom Stock Units Schedule of Future Minimum Rental Payments for Operating Leases Schedule of Regular Quarter Dividend Payments Statistical Measurement [Axis] Product and Service [Axis] Concentration Risk Type [Axis] Investments Defense costs per claim Operating lease assets Operating lease liabilities Concentration risk, percent Inventory valuation reserves Finished Goods Raw Materials Inventories - Net Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Line of credit facility, description Line of credit facility, maximum borrowing capacity Line of credit facility, expiration date Line of credit interest rate percentage Line of credit facility, interest rate description Line of credit facility, commitment fee description Line of credit period Line of credit facility Payment benefit to employee's Employee benefit payment term description Other compensation liabilities Other compensation liabilities, noncurrent Other compensation liabilities, current Cash surrender value of life insurance Loss contingencies, range of possible losses Deductibles per claim Potential liability per claim Maximum aggregate claim amount Liabilities recorded Share based compensation, description Share based compensation number of shares authorized Share based compensation vesting rights Unvested units outstanding Share based compensation grants in period Share based compensation weighted average grant date fair value Share based compensation paid in period Share based compensation vested shares Forfeiture rate of plan Share based compensation liability Share based compensation liability, current Share based compensation liability, non-current Compensation income Compensation expense Unrecognized compensation costs Compensation expense, weighted average recognize period Nonvested Units, Beginning balance Nonvested Units, Granted Nonvested Units, Vested Nonvested Units, Forfeited Nonvested Units, Canceled Nonvested Units, Ending Balance Phantom Stock Unit Awards Expected to Vest, Units Nonvested Weighted Average Grant Date Fair Value, Beginning balance Nonvested Weighted Average Grant Date Fair Value, Granted Nonvested Weighted Average Grant Date Fair Value, Vested Nonvested Weighted Average Grant Date Fair Value, Forfeited Nonvested Weighted Average Grant Date Fair Value, Canceled Nonvested Weighted Average Grant Date Fair Value, Ending Balance Phantom Stock Unit Awards Expected to Vest, Weighted Average Grant Date Fair Value Operating leases term, description Lease term Right-of-use assets Lease liability Lease liability, current Weighted average remaining lease term Discount rate Operating lease expense 2021 2022 2023 2024 2025 Thereafter Total Minimum Lease Payments Treasury stock, common, shares Payments of noncontrolling interest Share based payment award, granted Share based payment award, distributed Compensation cost Stock repurchase program, authorized amount Stock repurchased during period, shares Stock repurchased during period, value Stock repurchased during period, value per share Dividend Declared, Date Dividend Declared, Price Per Share Dividend Paid on or Before Date Dividend Paid on or Before Date, Amount Amount collected from related party Proceeds from loan Repayment of loan, description Represents the monetary amount of Accrued Commissions and Sales Incentives Change, during the indicated time period. Banbury [Member] Board of Directors [Member] Buildings [Member] Customer One [Member] December 2007 [Member] Declared Dividends. Represents the monetary amount of Engineering Expense, during the indicated time period. Houston [Member] Increase (Decrease) Lease Liability. January 1, 2019 [Member] January 1, 2019 [Member] January 2018 [Member] January 2019 [Member] July 2018 [Member] July 2017 [Member] Libo plus one [Member]. Loan Agreement [Member] Middletown [Member] New Rate [Member] No Other Customer [Member] Non-Employee Directors [Member] October 2018 [Member] October 2017 [Member] Phantom Stock Plan [Member] Qualified Non-contributory Profit-sharing Reduced [Member] Reduction Corporate Tax [Member] Restricted Stock Unit Awards [Member] Savings and Retirement Since Inception [Member] Stock repurchased during period, value per share. 2018 [Member] Long term taxes payable. Increase decrease in Right-Of-Use assets. U.S. Small Business Administration [Member] PPP Loan [Member] Repayment of loan, description. Defense costs per claim. Deductibles per claim. Potential liability per claim. Represents the Unvested units outstanding (number of shares), as of the indicated date. Forfeiture rate of plan. The net total number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that were granted, vested and forfeited during the reporting period. Share based compensation arrangement by share based payment award equity instruments other than options nonvested number expected to vest. The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. Phantom Stock Unit Awards Expected to Vest, Weighted Average Grant Date Fair Value. Operating leases term, description. Full Value Units [Member] One Significant Customer [Member] Gross number of share options (or share units) distributed during the period. Assets, Current Assets Liabilities, Current Deferred Income Tax Liabilities, Net Liabilities Treasury Stock, Value Stockholders' Equity Attributable to Parent Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Liabilities and Equity Gross Profit Operating Income (Loss) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Parent Shares, Outstanding Stock Issued During Period, Value, Stock Dividend Deferred Income Tax Expense (Benefit) Increase (Decrease) in Accounts Receivable Increase (Decrease) in Inventories IncreaseDecreaseInRightofuseAssets Increase (Decrease) in Other Operating Assets Increase (Decrease) in Accounts Payable Increase (Decrease) in Accrued Salaries Accrued Commissions and Sales Incentives Change Increase (Decrease) in Other Operating Liabilities Net Cash Provided by (Used in) Operating Activities Payments to Acquire Investments Payments to Acquire Property, Plant, and Equipment Net Cash Provided by (Used in) Investing Activities Payments of Dividends Net Cash Provided by (Used in) Financing Activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Inventory, Policy [Policy Text Block] Lessee, Leases [Policy Text Block] Subsequent Events, Policy [Policy Text Block] Short-term Investments Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Lessee, Operating Lease, Liability, to be Paid