Range [Axis] Minimum [Member] Maximum [Member] Award Type [Axis] December 2007 [Member] Scenario [Axis] Since Inception [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] Type of Arrangement and Non-arrangement Transactions [Axis] Loan Agreement [Member] Loss Contingency Nature [Axis] Insurance Claims [Member] Phantom Stock Plan [Member] Consolidated Entities [Axis] Foreign Subsidiary's [Member] Restricted Stock Unit Awards [Member] Geographical [Axis] Houston [Member] Middletown [Member] Banbury [Member] Subsequent Event Type [Axis] Subsequent Event [Member] Title of Individual [Axis] Non-Employee Directors [Member] Variable Rate [Axis] LIBOR plus [Member] LIBOR plus One [Member] Prime Rate Plus [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's Reporting Status Current Entity Interactive Data Current Entity Filer Category Entity Small Business Flag Entity Emerging Growth Company Entity Ex Transition Period 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 $946 and $985, respectively Investments Inventories-Net Other Current Assets Total Current Assets Right-Of-Use Assets 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 Other Liabilities Total Current Liabilities Lease Liability, net of current portion Deferred Taxes 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 at June 30, 2019 and December 31, 2018, respectively, and 10,094,322 and 10,091,822 shares outstanding at June 30, 2019 and December 31, 2018, respectively 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 (Expense) Income Before Income Taxes Income Tax Expense Net Income Less: Net Income attributable to the Noncontrolling Interest Net Income attributable to Omega Flex, Inc. Basic and Diluted Earnings per Common Share Cash Dividends Declared 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 Comprehensive Income Statement [Table] Statement [Line Items] Balance Balance, shares Cumulative Translation Adjustment Shares Reissued From Treasury Pursuant To Restricted Stock Unit Awards Shares Reissued From Treasury Pursuant To Restricted Stock Unit Awards, shares 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 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 Other Assets Accounts Payable Accrued Compensation Accrued Commissions and Sales Incentives Lease Liability, Net Other Liabilities Net Cash Provided by 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: Dividend Paid Net Cash Used in Financing Activities Net (Decrease) Increase 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 Cash paid for Interest Declared Dividends 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 Doubtful Accounts 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 Benchmark [Axis] Customer [Axis] Concentration Risk Type [Axis] Award Date [Axis] Defense costs per claim Operating lease assets Operating lease liability Income tax rate examination description Corporate tax rate percentage Concentration risk percentage description 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, fair value of amount outstanding Payment benefit to employee's Other compensation liabilities Other compensation liabilities, noncurrent Other compensation liabilities, current Cash surrender value of life insurance Amount of security to proceed current appeal Contingency, closed and settled date 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 grants paid in period Forfeiture rate of plan Share based compensation liability Share based compensation liability, current Share based compensation liability, non-current 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, Cancelled 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, Cancelled 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 Right-of-use assets Lease liability Lease liability, current Weighted average remaining lease term Discount rate Lease liability, payment term Operating lease expense 2020 2021 2022 2023 2024 Thereafter Total Lease Payments Treasury stock, common, shares Dividend paid Payments of noncontrolling interest Share based payment award, granted 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 Related parties amount secured by company Represents the monetary amount of Accrued Commissions and Sales Incentives Change, during the indicated time period. Amount of security to proceed current appeal. Banbury [Member] Board of Directors [Member] Buildings [Member] Customer One [Member] December 2007 [Member] Deductibles per claim. Defense costs per claim. Represents the monetary amount of Engineering Expense, during the indicated time period. Forfeiture rate of plan. Houston [Member] January 1, 2019 [Member] January 1, 2019 [Member] January 2018 [Member] January 2019 [Member] July 2018 [Member] July 2017 [Member] Loan Agreement [Member] Middletown [Member] New Rate [Member] October 2018 [Member] October 2017 [Member] Operating leases term, description. Phantom Stock Plan [Member] Potential liability per claim. Qualified Non-contributory Profit-sharing Reduced [Member] Reduction Corporate Tax [Member] Restricted Stock Unit Awards [Member] Savings and Retirement 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. Phantom Stock Unit Awards Expected to Vest, Weighted Average Grant Date Fair Value. 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. Since Inception [Member] Stock repurchased during period, value per share. 2018 [Member] Represents the Unvested units outstanding (number of shares), as of the indicated date. Increase (Decrease) Lease Liability. Lease liability, payment term. Declared Dividends. Non-Employee Directors [Member] Libo plus one [Member]. Assets, Current Assets Liabilities, Current Deferred 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 Income (Loss) Attributable to Noncontrolling Interest, before Tax Net Income (Loss) Attributable to Parent Other Comprehensive Income, Other, Net of Tax 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 Temporary Equity, Accretion of Dividends Deferred Income Tax Expense (Benefit) Increase (Decrease) in Accounts Receivable Increase (Decrease) in Inventories 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 Net Cash Provided by (Used in) Financing Activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Investment, Policy [Policy Text Block] Inventory, Policy [Policy Text Block] Lessee, Leases [Policy Text Block] Subsequent Events, Policy [Policy Text Block] 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 Operating Leases, Future Minimum Payments Due