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Note 11 - Leases (Details Textual) $ in Thousands	1 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2025 USD ($) ft²	Dec. 31, 2020 USD ($)	Sep. 30, 2025 USD ($) ft²	Feb. 29, 2020 ft²
Industrial Space in West Melbourne, Florida [Member]
Area of Real Estate Property (Square Foot) | ft²	54,000		54,000
Lessee, Operating Lease, Term of Contract (Year)	5 years		5 years
Lessee, Operating Lease, Annual Rental, Maintenance, and Tax Expense | $			$ 610
Office Space at Sawgrass Technology Park [Member]
Area of Real Estate Property (Square Foot) | ft²				6,857
Lessee, Operating Lease, Term of Contract (Year)				64 months
Lessee, Operating Lease, Annual Rental, Maintenance, and Tax Expense | $	$ 180	$ 1,514
Lessee, Operating Lease, Annual Percentage Increase in Rental, Maintenance, and Tax Expenses	3.00%

X

- Definition

Percentage of annual increase of annual rental, maintenance, and tax expenses attributable to operating leases.

+ References

No definition available.

+ Details

Name:	bkti_LesseeOperatingLeaseAnnualPercentageIncreaseInRentalMaintenanceAndTaxExpenses
Namespace Prefix:	bkti_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of annual rental, maintenance, and tax expenses attributable to operating leases.

+ References

No definition available.

+ Details

Name:	bkti_LesseeOperatingLeaseAnnualRentalMaintenanceAndTaxExpense
Namespace Prefix:	bkti_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_LeaseContractualTermAxis=bkti_IndustrialSpaceInWestMelbourneFloridaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LeaseContractualTermAxis=bkti_OfficeSpaceAtSawgrassTechnologyParkMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: