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Note 7 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2018
Aug. 31, 2018
Jul. 31, 2018
Dec. 31, 2017
Line of Credit Facility, Maximum Borrowing Capacity   $ 30,000 $ 40,000  
Long-term Line of Credit, Total $ 0     $ 0
Letters of Credit Outstanding, Amount 14,600     $ 12,900
Line of Credit Facility, Remaining Borrowing Capacity $ 15,400      
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 3.00%