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Note 11 - Common Shares (Details) - Share Repurchases - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Common stock repurchased on the open market or through tender offer        
Number of shares   1,062,456 79,392 1,064,299
Aggregate market value of shares (in thousands)   $ 23,616,286 $ 1,181,858 $ 6,537,616
Average price per share   $ 22.23 $ 14.89 $ 6.14
Common stock received in connection with share-based compensation        
Number of shares 99,675 99,675    
Aggregate market value of shares (in thousands)   $ 2,335,000    
Average price per share   $ 23.42