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Note 3 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2020
Nov. 30, 2020
Dec. 31, 2019
Aug. 31, 2019
Aug. 31, 2018
Jul. 31, 2018
Line of Credit Facility, Maximum Borrowing Capacity         $ 30,000 $ 40,000
Long-term Line of Credit, Total $ 0   $ 0      
Line of Credit Facility, Remaining Borrowing Capacity 13,000          
Line Of Credit Facility Dividend Restrictions Percentage Of Net Income Limit   25.00%   25.00%    
Line of Credit Facility, Waiver to Pay Dividends, Maximum   $ 60,000   $ 65,000    
Insurance Claims [Member]            
Letters of Credit Outstanding, Amount $ 17,000   $ 15,700      
Long-term Debt, Weighted Average Interest Rate, at Point in Time 0.80%