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Note 10 - Common Share - Share Repurchases (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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
Average price per share (in dollars per share) $ 23.28 $ 22.23 $ 14.89
Number of shares (in shares) 25,572 99,675
Aggregate market value of shares (in thousands) $ 634,000 $ 2,335,000
Average price per share (in dollars per share) $ 24.80 $ 23.42