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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)