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Note 3 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Nov. 30, 2020
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%  
Line of Credit Facility, Waiver to Pay Dividends, Maximum $ 80,000   $ 60,000  
Credit Facility [Member]        
Long-term Debt, Weighted Average Interest Rate, at Point in Time 0.78%