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Note 3 - Long-term Debt (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Apr. 30, 2016
Dec. 31, 2015
Nov. 30, 2015
Oct. 31, 2015
Line of Credit Facility, Maximum Borrowing Capacity $ 40.0 $ 30.0   $ 75.0 $ 50.0
Long-term Line of Credit 7.9   $ 37.9    
Letters of Credit Outstanding, Amount 11.2        
Line of Credit Facility, Remaining Borrowing Capacity $ 20.9        
Line Of Credit Facility Dividend Restrictions Percentage Of Net Income Limit 25.00%        
Credit Facility [Member]          
Long-term Debt, Weighted Average Interest Rate 1.46%