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Note 13 - Leases (Details Textual) $ in Thousands | 1 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 29, 2020 ft² | Dec. 31, 2020 USD ($) | Sep. 30, 2024 USD ($) ft²
Industrial Space in West Melbourne, Florida [Member] |  |  |
Area of Real Estate Property (Square Foot) | ft² |  |  | 54,000
Lessee, Operating Lease, Term of Contract (Year) |  |  | 5 years
Lessee, Operating Lease, Annual Rental, Maintenance, and Tax Expense | $ |  |  | $ 491
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 | $ |  | $ 196 |
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
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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
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Namespace Prefix: | bkti_
Data Type: | xbrli:monetaryItemType
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X
- Definition Area of a real estate property. + References No definition available. + Details
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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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X
- Details
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Namespace Prefix: |
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X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |