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Note 10 - Common Shares (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 07, 2015
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Feb. 09, 2016
Feb. 11, 2015
Common Stock, Shares Authorized   250,000,000 250,000,000 250,000,000 250,000,000      
Common Stock, Shares, Outstanding 11,135,825 10,685,599 10,461,574 10,685,599 10,685,599      
Stock Repurchased and Retired During Period, Shares     308,416   1,062,456 79,392    
Stock Repurchased and Retired During Period, Value     $ 7,180,257   $ 23,616,286 $ 1,181,857    
Common Stock, Shares, Issued 11,135,825 10,685,599 10,461,574 10,685,599 10,685,599      
Stock Buyback Program 2016 [Member]                
Stock Repurchase Program, Authorized Amount             $ 40,000,000  
Stock Repurchased and Retired During Period, Shares     308,416          
Stock Repurchased and Retired During Period, Value     $ 7,200,000          
Stock Buyback Program 2015 [Member]                
Stock Repurchase Program, Authorized Amount               $ 20,000,000
Stock Repurchased and Retired During Period, Shares   231,047     868,549      
Stock Repurchased and Retired During Period, Value   $ 5,400,000     $ 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 $ 100,000