XML 129 R113.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Income Taxes: CARES Act (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($)
Income Tax Disclosure [Abstract] |
Amount of Payroll Tax (Social Security Employment Tax) Deferral Allowed Under the CARES Act | $ 10,000
Amount of Payroll Tax (Social Security Employment Tax) Deferral Under the Cares Act Disbursed in the current year | 4,800
Gross Payroll Tax Credits Recognized (Cares Act) | $ 1,200

X
- Definition Amount of Payroll Tax (Social Security Employment Tax) Deferral Allowed Under the CARES Act + References No definition available. + Details
Name: | bkh_AmountOfPayrollTaxSocialSecurityEmploymentTaxDeferralAllowedUnderTheCARESAct
Namespace Prefix: | bkh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of Payroll Tax (Social Security Employment Tax) Deferral Under the Cares Act - Disbursed in the current year + References No definition available. + Details
Name: | bkh_AmountOfPayrollTaxSocialSecurityEmploymentTaxDeferralUnderTheCaresActDisbursedInTheCurrentYear
Namespace Prefix: | bkh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gross Payroll Tax Credits Recognized upon the completion of the Cares Act employee retention tax credits study + References No definition available. + Details
Name: | bkh_GrossPayrollTaxCreditsRecognizedCaresAct
Namespace Prefix: | bkh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration