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Note 12 - Shareholders' Equity - Computation of Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income attributable to Common shareholders $ 4,147 $ 1,930 $ 2,143
Weighted average shares outstanding (in shares) 3,894,222 3,953,281 3,924,618
Basic earnings per common share (in dollars per share) $ 1.06 $ 0.49 $ 0.55
Net income attributable to Common shareholders $ 4,147 $ 1,930 $ 2,143
Effect of potentially dilutive restricted common shares (in shares) 2,963
Weighted average diluted shares outstanding (in shares) 3,897,185 3,953,281 3,924,618
Diluted earnings per common share (in dollars per share) $ 1.06 $ 0.49 $ 0.55