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Note 3 - Long-Term Debt (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Nov. 30, 2015
Dec. 31, 2014
Minimum [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 50.0  
Maximum [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 75.0  
Credit Facility [Member]      
Long-term Debt, Weighted Average Interest Rate 1.10%    
Long-term Line of Credit $ 37.9   $ 24.4
Letters of Credit Outstanding, Amount 10.4    
Line of Credit Facility, Remaining Borrowing Capacity $ 26.7    
Line Of Credit Facility Dividend Restrictions Percentage Of Net Income Limit 25.00%