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Income Taxes (Summary of Tax Years Subject to Examination by Major Taxing Jurisdictions) (Details) | 12 Months Ended
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Dec. 31, 2021
Federal [Member] | Earliest Tax Year [Member] |
Income Tax Examination [Line Items] |
Tax years subject to examination | 2018
Federal [Member] | Latest Tax Year [Member] |
Income Tax Examination [Line Items] |
Tax years subject to examination | 2021
Arkansas [Member] | State and Local [Member] | Earliest Tax Year [Member] |
Income Tax Examination [Line Items] |
Tax years subject to examination | 2018
Arkansas [Member] | State and Local [Member] | Latest Tax Year [Member] |
Income Tax Examination [Line Items] |
Tax years subject to examination | 2021
Idaho [Member] | State and Local [Member] | Earliest Tax Year [Member] |
Income Tax Examination [Line Items] |
Tax years subject to examination | 2018
Idaho [Member] | State and Local [Member] | Latest Tax Year [Member] |
Income Tax Examination [Line Items] |
Tax years subject to examination | 2021
Michigan [Member] | State and Local [Member] | Earliest Tax Year [Member] |
Income Tax Examination [Line Items] |
Tax years subject to examination | 2017
Michigan [Member] | State and Local [Member] | Latest Tax Year [Member] |
Income Tax Examination [Line Items] |
Tax years subject to examination | 2021
Minnesota [Member] | State and Local [Member] | Earliest Tax Year [Member] |
Income Tax Examination [Line Items] |
Tax years subject to examination | 2017
Minnesota [Member] | State and Local [Member] | Latest Tax Year [Member] |
Income Tax Examination [Line Items] |
Tax years subject to examination | 2021

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- Definition Tax year that remains open to examination under enacted tax laws, in YYYY format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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