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Note 3 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2021
Aug. 31, 2021
Dec. 31, 2020
Nov. 30, 2020
Aug. 31, 2019
Aug. 31, 2018
Line of Credit Facility, Maximum Borrowing Capacity           $ 30,000
Long-term Line of Credit, Total $ 0   $ 0      
Letters of Credit Outstanding, Amount 18,500   $ 17,000      
Line of Credit Facility, Remaining Borrowing Capacity $ 11,500          
Line Of Credit Facility Dividend Restrictions Percentage Of Net Income Limit 25.00%     25.00%    
Line of Credit Facility, Waiver to Pay Dividends, Maximum $ 80,000 $ 80,000   $ 60,000 $ 65,000  
Credit Facility [Member]            
Long-term Debt, Weighted Average Interest Rate, at Point in Time 0.78%