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Note 6 - Borrowings (Details Textual) - Revolving Credit Facility [Member] - USD ($)
$ in Thousands
May 25, 2016
Sep. 30, 2017
Dec. 31, 2016
May 25, 2015
Apr. 16, 2015
Long-term Line of Credit   $ 0 $ 0    
Regions Bank and PNC Bank N.A. [Member]          
Line of Credit Facility, Maximum Borrowing Capacity $ 165,000       $ 150,000
Line of Credit, Additional Borrowing Capacity $ 15,000        
Line of Credit Facility, Expiration Period 5 years        
Line of Credit Facility Sublimit for Letters of Credit       $ 30,000  
Line of Credit Facility Swingline Loans       $ 15,000