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Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Common stock; $0.60 par value; 10,000,000 authorized shares; 4,125,236 and 4,092,056 issued, and 3,768,151 and 3,733,733 outstanding shares as of June 30, 2026 and December 31, 2025, respectively Awarded, Weighted Average Remaining Contractual Life (Year) Weighted-average contractual term remaining for option award granted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Vested and Expected to Vest, fair market value per share (in dollars per share) The fair market value of shares that have vested and are expected to vest. Fair Value of Financial Instruments, Policy [Policy Text Block] Ending UnVested, fair market value per share (in dollars per share) Fair market value at which grantees can acquire the nonvested shares reserved for issuance under the stock option plan. Awarded, fair market value per share (in dollars per share) Fair market value at which option are granted at. Customer A [Member] Customer A Schedule of Inventory, Current [Table Text Block] Exercised / Released, fair market value per share (in dollars per share) Fair market value at which option holders acquired shares when converting their stock options into shares. bkti_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingFairMarketValue Outstanding, fair market value per share (in dollars per share) Ending Outstanding, fair market value per share (in dollars per share) The fair market value for the outstanding options. Proceeds from exercise of common stock options Awarded, weighted average remaining vesting term (Year) Weighted-average vesting term remaining for option award granted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. 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Document Fiscal Period Focus Customer [Domain] Document Fiscal Year Focus Amendment Flag Common Stock [Member] us-gaap_LineOfCreditFacilityExpirationPeriod Line of Credit Facility, Expiration Period (Year) us-gaap_ShortTermBorrowings Short-Term Debt Concentration Risk [Table] Subsequent Events [Text Block] Concentration Risk Type [Axis] Document Period End Date bkti_IncreaseDecreaseInAccruedWarrantyExpenses Accrued warranty expense Amount of increase (decrease) during the reporting period in accrued warranty expense. 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Entity Current Reporting Status Accounts Receivable [Member] Entity Incorporation, State or Country Code Vested and Expected to Vest, Weighted Average Remaining Contractual Life (Year) Current Fiscal Year End Date Exercisable, Weighted Average Remaining Contractual Life (Year) Concentration Risk Type [Domain] Ending UnVested, Weighted Average Exercise Price per Share (in dollars per share) Weighted average price at which grantees can acquire the nonvested shares reserved for issuance under the stock option plan. Nonvested, Weighted Average Remaining Contractual Life (Year) Weighted average remaining contractual term for nonvested options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Engineering and product development Engineering and product development Entity Filer Category Entity Shell Company Entity Emerging Growth Company Entity Small Business Operating income us-gaap_OperatingIncomeLoss Operating income Expired, Weighted Average Grant Date Fair Value per Share (in dollars per share) The weighted average grant-date fair value of options expired during the reporting period as calculated by applying the disclosed option pricing methodology. bkti_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValue Outstanding, Weighted Average Grant Date Fair Value per Share (in dollars per share) Outstanding, Weighted Average Grant Date Fair Value per Share (in dollars per share) Weighted average grant-date fair value of options outstanding. Proceeds from disposal of property, equipment and plant Ending Vested, Weighted Average Grant Date Fair Value per Share (in dollars per share) Weighted average grant-date fair value of vested options outstanding. Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Ending Vested, Stock Options (in shares) UnVested, Aggregate Intrinsic Value Amount by which the current fair value of the underlying non-vested stock exceeds the exercise price of options that are non-vested. Ending UnVested, Stock Options (in shares) Other income (expense) (a) us-gaap_SegmentReportingOtherItemAmount Entity Address, State or Province Statement of Stockholders' Equity [Abstract] Inventory, Current [Table] Entity Address, City or Town Forfeited, Weighted Average Grant Date Fair Value per Share (in dollars per share) us-gaap_InterestExpenseNonoperating Interest income United States Government Agencies [Member] Represents information pertaining to the United States government agencies. Retained earnings (accumulated deficit) Entity Address, Address Line One Ending UnVested, Weighted Average Grant Date Fair Value per Share (in dollars per share) Ending Vested, Weighted Average Exercise Price per Share (in dollars per share) Statement of Cash Flows [Abstract] City Area Code Local Phone Number Entity Address, Postal Zip Code Title of 12(b) Security Equity Components [Axis] Security Exchange Name Trading Symbol Operating lease ROU assets and lease liabilities Class of Stock [Axis] Equity Component [Domain] Entity Common Stock, Shares Outstanding Additional Paid-in Capital [Member] Retained Earnings [Member] Earnings Per Share [Text Block] Cost of products Cost of products Inventories allowances Property, plant and equipment, net Allowance for credit losses Subsequent Event [Table] bkti_LesseeOperatingLeaseAnnualRentalMaintenanceAndTaxExpense Lessee, Operating Lease, Annual Rental, Maintenance, and Tax Expense Amount of annual rental, maintenance, and tax expenses attributable to operating leases. Deferred tax assets, net bkti_LesseeOperatingLeaseAnnualPercentageIncreaseInRentalMaintenanceAndTaxExpenses Lessee, Operating Lease, Annual Percentage Increase in Rental, Maintenance, and Tax Expenses Percentage of annual increase of annual rental, maintenance, and tax expenses attributable to operating leases. Capitalized software and systems integration costs, net Amount of capitalized software and systems integration costs. bkti_PaymentsForCapitalizedSoftwareAndSystemsIntegration Capitalized software and systems integration costs The cash outflow associated with capitalized software and systems integreation. Office Space at Sawgrass Technology Park [Member] Represents information pertaining to office space at Sawgrass Technology Park. Exercisable, Aggregate Intrinsic Value Industrial Space in West Melbourne, Florida [Member] Represents information pertaining to the lease for industrial space in West Melbourne, Florida. Common Stock, Par or Stated Value Per Share (in dollars per share) Basis of Accounting, Policy [Policy Text Block] Stockholders’ equity: Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] us-gaap_OtherNonoperatingExpense Other expense Share-Based Payment Arrangement, Option, Activity [Table Text Block] us-gaap_Assets Total assets Cash and cash equivalents Gain on disposal of property, plant and equipment Gain on disposal of property, plant and equipment Deferred Policy Acquisition Cost [Table] Share-Based Payment Arrangement, Option [Member] Supplemental disclosure Current liabilities: us-gaap_LiabilitiesCurrent Total current liabilities Earnings per share-diluted: (in dollars per share) Diluted earnings per share (in dollars per share) Deferred revenue, net of current portion us-gaap_ContractWithCustomerLiabilityNoncurrent Customer [Axis] Deferred revenue Trade accounts receivable, net Forfeited, Aggregate Intrinsic Value Amount by which the current fair value of the underlying stock exceeds the exercise price of options forfeited during the period. Depreciation and amortization Customer Concentration Risk [Member] Fifth Third Credit Agreement [Member] Information pertaining to the credit agreement. Lease, Cost [Table Text Block] Consolidation, Policy [Policy Text Block] Marketing and selling us-gaap_MarketingExpense Cash paid for interest Inventory Disclosure [Text Block] Revenue Benchmark [Member] Long-term uncertain tax position liability The amount of increase/decrease in long-term uncertain tax positions. Other Commitments [Table] Lessee, Operating Lease, Supplemental Cash Flow Information [Table Text Block] The entire tabular disclosure for the supplemental cash flow information in regards to operating leases. us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition Share-based compensation expense-restricted stock units us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition Share-based compensation expense-stock options Inventories, net Inventory, Net General and administrative General and administrative us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Income before income taxes Additional paid-in capital Single Reportable Segment [Member] Relating to a single reporting segment. us-gaap_InventoryGross Inventory, Gross us-gaap_IncreaseDecreaseInContractWithCustomerLiability Deferred revenue us-gaap_StockholdersEquity Total stockholders’ equity Balance Balance Cashless exercise of stock options, warrants and related conversion of net shares to stockholders' equity The amount related to the cashless exercise of stock options related to the conversion of net shares of stockholders' equity. 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Issuance of common stock under employee purchase plan Common stock issued - exercised warrants Value of stock issued as a result of the exercise of warrants. us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchases of property, plant, and equipment Lessee, Operating Leases [Text Block] Concentration Risk Benchmark [Axis] us-gaap_InventoryValuationReserves Inventory reserve Concentration Risk Benchmark [Domain] Current assets: Stock option exercises Operating lease right-of-use (ROU) assets Common stock issued under restricted stock units us-gaap_AssetsCurrent Total current assets ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Sales, net Sales, net Gross margin us-gaap_GrossProfit Gross margin Commitments and contingencies (Note 7) Restricted Stock Units (RSUs) [Member]