2023 Finance Lease, Liability, Payments, Due Year Four Foreign currency translation gain (loss) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent REVENUES (note 8) Revenue from Contract with Customer [Abstract] Title of Individual [Axis] Title of Individual [Axis] City Area Code City Area Code Stock based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Accounts receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 2021 Finance Lease, Liability, Payments, Due Year Two Total Current Liabilities Liabilities, Current Title of 12(b) Security Title of 12(b) Security Prepaid expenses Increase (Decrease) in Prepaid Expense LEASES Lessee, Finance Leases [Text Block] Accrual liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Liabilities, Current Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Liabilities, Current Liabilities Earnings Per Share [Abstract] MEP Millstream Energy Products, LTD. (MEP) [Member] Millstream Energy Products, LTD. (MEP) Treasury stock (in shares) Treasury Stock, Shares Other Acquisition Liabilities, Current Acquisition Liabilities, Current Number of shares granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Total Cost of Goods Sold Cost of Goods and Services Sold INCOME (LOSS) BEFORE INCOME TAXES Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Sale of investments Payments for (Proceeds from) Investments Escrow deposit Escrow Deposit Current Fiscal Year End Date Current Fiscal Year End Date Service Service [Member] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Weighted average (in dollars per share) Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount Short-term investments Marketable Securities, Current FULLY DILUTED WEIGHTED AVG NUMBER OF SHARES OUTSTANDING (in shares) Weighted average diluted shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Entity Address, Postal Zip Code Entity Address, Postal Zip Code Stock issued in settlement of RSUs (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Total financing lease cost Lease, Cost Property and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Canada CANADA Total Operating Expenses Operating Expenses Less: Amount representing interest Finance Lease, Liability, Undiscounted Excess Amount Property and equipment, net Property, Plant and Equipment, Net Effect of Dilutive Securities, Stock options & RSUs (shares) Weighted Average Number Diluted Shares Outstanding Adjustment Accumulated 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[Domain] Scenario [Domain] Treasury stock repurchased (in shares) Treasury Stock, Shares, Acquired Work in process Inventory, Work in Process, Gross Income taxes payable Accrued Income Taxes, Current Total future minimum lease payments Finance Lease, Liability, Payment, Due Accounts receivable Increase (Decrease) in Accounts Receivable Schedule of Inventory Schedule of Inventory, Current [Table Text Block] CURRENT LIABILITIES Liabilities, Current [Abstract] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] 2017 LTIP LTIP 2017 [Member] LTIP 2017 Current financing lease liability (note 5) Current portion Finance Lease, Liability, Current Range [Axis] Statistical Measurement [Axis] SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION Supplemental Cash Flow Information [Abstract] SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] Effect of exchange rate changes on cash Effect of Exchange Rate on Cash, Cash 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Revenue Period Royalty Revenue Period Entity Central Index Key Entity Central Index Key Entity File Number Entity File Number Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Compensation expense Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Entity Emerging Growth Company Entity Emerging Growth Company Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Unrecognized compensation cost Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Treasury Stock Treasury Stock [Member] Document Fiscal Period Focus Document Fiscal Period Focus Balance, beginning of period (in shares) Balance, end of period (in shares) Shares, Issued CASH PAID FOR: CASH PAID FOR: Employee-related payables Employee-related Liabilities, Current Treasury stock, at cost Treasury stock, at cost Treasury Stock, Value Stock awards issued for services Issuance of Stock and Warrants for Services or Claims Vice President of Product Development Vice President of Product Development [Member] Vice President of Product Development Products and Services [Domain] Product and Service [Domain] Future Minimum Lease Payments to Discounted Finance Lease Liability Finance Lease, Liability, Maturity [Table Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] INCOME (LOSS) FROM OPERATIONS Operating Income (Loss) Goodwill Goodwill Goodwill Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Product Product [Member] Statement [Line Items] Statement [Line Items] Total Revenues Sales Revenue from Contract with Customer, Excluding Assessed Tax Disaggregation of Revenue by Product Line Disaggregation of Revenue [Table Text Block] 2020 - remaining Finance Lease, Liability, Payments, Remainder of Fiscal Year NON-CASH FINANCING AND INVESTING ACTIVITIES: Noncash or Part Noncash Acquisition, Value of Assets Acquired [Abstract] BASIC EARNINGS PER SHARE (in dollars per share) Basic earnings per share (in dollars per share) Earnings Per Share, Basic INVENTORIES Inventory Disclosure [Text Block] FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Total Other Comprehensive Income (Loss) Other Comprehensive Income (Loss), Net of Tax Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities COMPREHENSIVE INCOME (LOSS) Comprehensive Income (Loss), Net of Tax, Attributable to Parent 2014 EIP EIP 2014 [Member] EIP 2014 Plan Name [Axis] Plan Name [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Executive Officer Executive Officer [Member] Electronics ElectronicsMember Stock Business Combination, Consideration Transferred, Liabilities Incurred Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Statement of Stockholders' Equity [Abstract] Amendment Flag Amendment Flag Re-Sell ReSellMember Purchase of fixed assets Payments to Acquire Property, Plant, and Equipment Proceeds from issuance of long-term debt Proceeds from Issuance of Long-term Debt Vice President of Operations Vice President of Operations [Member] Vice President of Operations Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Inventory Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Lease term Lessee, Finance Lease, Term of Contract Stock options & RSUs Dilutive Securities, Effect on Basic Earnings Per Share Plan Name [Domain] Plan Name [Domain] STOCKHOLDERS' EQUITY Stockholders' Equity Note Disclosure [Text Block] Unrealized gains (losses) on investments Unrealized Gain (Loss) on Investments Common stock issued in settlement of accrued bonuses Noncash or Part Noncash Acquisition, Other Assets Acquired Bad debt expense Accounts Receivable, Credit Loss Expense (Reversal) Subsequent Event [Table] Subsequent Event [Table] Accounting Policies [Abstract] Additional Paid-In Capital Additional Paid-in Capital [Member] REVENUE Revenue from Contract with Customer [Text Block] One-time executive bonus (in shares) Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture Gain on sale of fixed assets Gain (Loss) on Disposition of Assets Raw materials Inventory, Raw Materials, Gross Local Phone Number Local Phone Number Weighted average remaining lease term Finance Lease, Weighted Average Remaining Lease Term Interest income Investment Income, Interest Relationship to Entity [Domain] Title of Individual [Domain] Proceeds from sale of equipment Proceeds from Sale of Machinery and Equipment Prepaid expenses and other current assets Prepaid Expense, Current Net deferred income tax liability Deferred Income Tax Liabilities, Net Cash Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents United States UNITED STATES Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Business Combinations Business Combination, Separately Recognized Transactions [Table Text Block] Years ending December 31, Finance Lease, Liability, Payment, Due [Abstract] Stock issued in settlement of RSUs Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Total Other Income Nonoperating Income (Expense) Additional paid-in capital Additional Paid in Capital Interest rate Debt Instrument, Interest Rate, Stated Percentage Finished goods Inventory, Finished Goods, Gross Entity Address, Address Line One Entity Address, Address Line One Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Chief Executive Officer Chief Executive Officer [Member] Chief Business Development Officer Chief Business Development Officer [Member] Chief Business Development Officer Business Combinations [Abstract] Subtotal Inventory, Gross Short-term lease cost Short-term Lease, Cost Number of shares approved (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross GROSS PROFIT Gross Profit Segment Geographical [Domain] Geographical [Domain] Stock issued in exercise of stock options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Cash Payments to Acquire Businesses, Gross Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Acquisition liabilities Product Warranty Accrual, Current Entity Address, State or Province Entity Address, State or Province Business Acquisition [Axis] Business Acquisition [Axis] Total Current Assets Assets, Current Entity Current Reporting Status Entity Current Reporting Status OTHER INCOME (EXPENSE) Other Income and Expenses [Abstract] Expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Tranche One Share-based Payment Arrangement, Tranche One [Member] Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Investing Activities NET CHANGE IN CASH Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect LONG-TERM LIABILITIES Liabilities, Noncurrent [Abstract] NET INCOME (LOSS) Net income Profit (Loss) Net income (loss) available to common stockholders Net Income (Loss) Attributable to Parent Cash received in exercise of stock options Proceeds from Stock Options Exercised Tranche Two Share-based Payment Arrangement, Tranche Two [Member] Common Stock Common Stock [Member] CURRENT ASSETS Assets, Current [Abstract] Acquisition purchase price Business Combination, Consideration Transferred Income taxes Income Taxes Paid 2022 Finance Lease, Liability, Payments, Due Year Three Leases [Abstract] Debt Instrument [Axis] Debt Instrument [Axis] Business Acquisition [Line Items] Business Acquisition [Line Items] General and administrative expenses General and Administrative Expense Accounts payable Accounts Payable, Current Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Financing right-of-use asset Finance Lease, Right-of-Use Asset Prepaid expenses Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Maximum target bonus multiplier Share-Based Compensation Arrangements By Share-based Payment Award, Maximum Target Bonus Multiplier Share-Based Compensation Arrangements By Share-based Payment Award, Maximum Target Bonus Multiplier Products and Services [Axis] Product and Service [Axis] Manufactured ManufacturedMember Accrued liabilities (note 4) Total Accrued Liabilities, Current Income (Numerator) Net Income (Loss) Available to Common Stockholders, Operations, Diluted [Abstract] Entity Small Business Entity Small Business Scenario [Axis] Scenario [Axis] Entity Interactive Data Current Entity Interactive Data Current Unrealized gains on investments Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Common stock, shares issued (in shares) Common Stock, Shares, Issued Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Value of equity awards surrendered by employees for tax liability ValueOfEquityAwardsSurrenderedByEmployeesForTaxLiability Entity Filer Category Entity Filer Category Consideration held for seller obligations, period Business Combination, Consideration Transferred, Liabilities Incurred, Holding Period Business Combination, Consideration Transferred, Liabilities Incurred, Holding Period Return period Contract With Customer, Return Period Contract With Customer, Return Period Warranty liabilities Other Accrued Liabilities, Current Inventories, net (note 3) Total Inventory, Net Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity LONG-TERM ASSETS Assets, Noncurrent [Abstract] Entity Address, City or Town Entity Address, City or Town Interest on lease liabilities Finance Lease, 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Executive Compensation Target Bonus Payout Award vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage COST OF SALES Cost of Goods and Services Sold [Abstract] STOCKHOLDERS' EQUITY (note 6) Stockholders' Equity Attributable to Parent [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Performance goal weight Performance Goal Weight Performance Goal Weight Restricted Stock Units Restricted Stock Units (RSUs) [Member] SUBSEQUENT EVENTS Subsequent Events [Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] TOTAL LIABILITIES Liabilities ACQUISITIONS Business Combination Disclosure [Text Block] Award Type [Axis] Award Type [Axis] Reclassification Reclassification, Policy [Policy Text Block] CONDENSED FINANCIAL STATEMENTS Condensed Financial Statements [Text Block] Common stock: $0.001 par value, 100,000,000 shares authorized: 51,098,039 issued and 47,685,661 outstanding at March 31, 2020, and 50,824,355 issued and 47,411,977 outstanding at December 31, 2019 Common Stock, Value, Issued ACCRUED LIABILITIES Accounts Payable and Accrued Liabilities Disclosure [Text Block] Research and development Research and Development Expense Other income (expense) Other Nonoperating Income (Expense) Vesting [Domain] Vesting [Domain] Subsequent Events [Abstract] Subsequent Events [Abstract] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Inventories Increase (Decrease) in Inventories Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Statement Geographical [Axis] Geographical [Axis] Retained Earnings Retained Earnings [Member] 2019 EIP EIP 2019 [Member] EIP 2019 Subsequent Event Type [Domain] Subsequent Event Type [Domain] Condensed Financial Information of Parent Company Only Disclosure [Abstract] Condensed Financial Information Disclosure [Abstract] BASIC WEIGHTED AVG NUMBER OF SHARES OUTSTANDING (in shares) Weighted average basic shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Subsequent Event [Line Items] Subsequent Event [Line Items] Long-term investments Marketable Securities, Noncurrent Equity Components [Axis] Equity Components [Axis] Document Period End Date Document Period End Date 2024 Finance Lease, Liability, Payments, Due Year Five Weighted Average Shares (Denominator) Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Statement [Table] Statement [Table] Entity Registrant Name Entity Registrant Name Acquisition related costs Business Combination, Acquisition Related Costs TOTAL STOCKHOLDERS' EQUITY Balance, beginning of period Balance, end of period Stockholders' Equity Attributable to Parent Stock Transactions, Parenthetical Disclosures [Abstract] Deferred tax asset/liability Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Maximum Maximum [Member] Net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Components of Financing Lease Cost Lease, Cost [Table Text Block] 2019 LTIP LTIP 2019 [Member] LTIP 2019 Depreciation and amortization expense Depreciation, Depletion and Amortization Product warranty term Contract With Customer, Product Warranty Term Contract With Customer, Product Warranty Term Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Forecast Forecast [Member] Retained earnings Retained Earnings (Accumulated Deficit) Preferred stock: $0.001 par value, 10,000,000 shares authorized: no shares issued or outstanding Preferred Stock, Value, Issued Royalty percentage Royalty Percentage Royalty Percentage Purchase of treasury stock Payments for Repurchase of Common Stock Treasury stock repurchased Treasury Stock, Value, Acquired, Cost Method Security Exchange Name Security Exchange Name Entity Tax Identification Number Entity Tax Identification Number Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Midflow Services, LLC Midflow Services, LLC [Member] Midflow Services, LLC FULLY DILUTED EARNINGS PER SHARE (in dollars per share) Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Long-Lived Assets Long-Lived Assets Net Cash Provided by Operating Activities Net Cash Provided by (Used in) Operating Activities Equity Component [Domain] Equity Component [Domain] Trading Symbol Trading Symbol Minimum Minimum [Member] Document Transition Report Document Transition Report Income taxes receivable/payable Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Employee Stock Option Share-based Payment Arrangement, Option [Member] Income tax receivable Income Taxes Receivable Principal paid towards lease liability Finance Lease, Principal Payments Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Reserve for obsolescence Inventory Valuation Reserves Net income available to common stockholders + assumed conversions Net Income (Loss) Available to Common Stockholders, Diluted Range [Domain] Statistical Measurement [Domain] Long-term financing lease liability (note 5) Long-term portion Finance Lease, Liability, Noncurrent Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Gain on sale of fixed assets DisposalGroupNotDiscontinuedOperationGainLossonDisposalAfterForeignCurrencyTranslation Accounts payable Business Combination, Recognized Identifiable Assets Acquired and 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