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v3.22.4

Subsequent events (Details Narrative) - Subsequent Event - Sales Agreement Member $ / shares in Units, $ in Thousands | 1 Months Ended
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Jan. 31, 2023 USD ($) $ / shares shares
Sale of common stock per share | $ / shares | $ 0.60
Maximum number of share sell | shares | 4,225,352
Share offering price | $ | $ 15,000,000

X
- References No definition available. + Details
Name: | bkti_ShareAggregateOfferingPriceValue
Namespace Prefix: | bkti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=bkti_SalesAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |