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Note 3 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Apr. 25, 2016
Nov. 30, 2015
Line of Credit Facility, Maximum Borrowing Capacity   $ 40,000 $ 30,000 $ 75,000
Long-term Line of Credit $ 0 $ 7,900    
Letters of Credit Outstanding, Amount 12,900      
Line of Credit Facility, Remaining Borrowing Capacity $ 27,100      
Line Of Credit Facility Dividend Restrictions Percentage Of Net Income Limit 25.00%      
Credit Facility [Member]        
Long-term Debt, Weighted Average Interest Rate, at Point in Time   1.46%