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Note 3 - Long-term Debt (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Nov. 30, 2015
Minimum [Member]      
Line of Credit Facility, Maximum Borrowing Capacity     $ 50,000,000
Maximum [Member]      
Line of Credit Facility, Maximum Borrowing Capacity     $ 75,000,000
Credit Facility [Member]      
Long-term Debt, Weighted Average Interest Rate   1.10%  
Long-term Line of Credit $ 0 $ 37,900,000  
Letters of Credit Outstanding, Amount 8,600,000    
Line of Credit Facility, Remaining Borrowing Capacity $ 66,400,000    
Line Of Credit Facility Dividend Restrictions Percentage Of Net Income Limit 25.00%