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Note 3 - Long-term Debt (Details Textual) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Apr. 25, 2016
Dec. 31, 2015
Nov. 30, 2015
Oct. 31, 2015
Credit Facility [Member]          
Long-term Debt, Weighted Average Interest Rate 1.20%        
Line of Credit Facility, Maximum Borrowing Capacity   $ 30.0   $ 75.0 $ 50.0
Long-term Line of Credit $ 8.5   $ 37.9    
Letters of Credit Outstanding, Amount 11.2        
Line of Credit Facility, Remaining Borrowing Capacity $ 10.2        
Line Of Credit Facility Dividend Restrictions Percentage Of Net Income Limit 25.00%