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Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Deferred Tax Assets, Valuation Allowance, Total | $ 0 | $ 0 |
Income Tax Examination, Penalties and Interest Accrued Liabilities (Receivables) | (3,000) | (1,000) |
Income Tax Examination, Penalties and Interest Expense (Benefit) | (2,000) | (5,000) | $ 5,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 31,000 | 31,000 | $ 52,000
State and Local Jurisdiction [Member] | Nebraska, Iowa, Arkansas, and Idaho Department of Revenue [Member] |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | $ (95,000) |  |
State and Local Jurisdiction [Member] | Nebraska, Oklahoma, Idaho, Louisiana and Arkansas Department of Revenue [Member] |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | $ (32,000) |

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- Definition The amount of estimated penalties and interest accrued as liabilities (receivables) as of the balance sheet date arising from income tax examinations. + References No definition available. + Details
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- Definition The sum of the amounts of estimated penalties and interest expense (benefit) recognized in the period arising from income tax examinations. + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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