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Note 13 - Stockholders' Equity (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Feb. 09, 2016
Feb. 11, 2015
Stock Buyback Program 2016 [Member]            
Stock Repurchased and Retired During Period, Shares 0   308,416      
Stock Repurchased and Retired During Period, Value $ 0   $ 7,200,000      
Stock Repurchase Program, Authorized Amount         $ 40,000,000  
Stock Buyback Program 2015 [Member]            
Stock Repurchased and Retired During Period, Shares   398,000 0 637,502    
Stock Repurchased and Retired During Period, Value   $ 10,000,000   $ 14,500,000    
Stock Repurchase Program, Authorized Amount           $ 20,000,000
Tender Offer [Member]            
Stock Repurchased and Retired During Period, Shares       193,907    
Stock Repurchased and Retired During Period, Value       $ 3,600,000    
Treasury Stock Acquired, Average Cost Per Share       $ 18.50    
Stock Repurchased Transaction Costs       $ 70,000    
Stock Repurchased and Retired During Period, Value     $ 7,180,257