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Note 4 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Apr. 25, 2016
Nov. 30, 2015
Line of Credit Facility, Maximum Borrowing Capacity   $ 40,000 $ 30,000 $ 75,000
Line of Credit Facility, Remaining Borrowing Capacity $ 27,400      
Long-term Line of Credit 0 7,900    
Letters of Credit Outstanding, Amount $ 12,600 $ 11,200    
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%