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Note 4 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
Sep. 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      
Letters of Credit Outstanding, Amount 17,000 $ 15,700      
Line of Credit Facility, Remaining Borrowing Capacity $ 13,000        
Line Of Credit Facility Dividend Restrictions Percentage Of Net Income Limit     25.00%    
Line of Credit Facility, Waiver to Pay Dividends, Maximum     $ 65,000    
Credit Facility [Member]          
Long-term Debt, Weighted Average Interest Rate, at Point in Time 0.84%