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Note 7 - Earnings Per Share - Computation of Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic earnings per share:
Net income attributable to Common shareholders	$ 1,065	$ 1,730
Weighted average shares outstanding (in shares)	3,900,513	3,892,726
Basic earnings per common share (in dollars per share)	$ 0.27	$ 0.44
Diluted earnings per share:
Net income attributable to Common shareholders	$ 1,065	$ 1,730
Weighted average shares outstanding (in shares)	3,900,513	3,892,726
Effect of potentially dilutive restricted common shares (in shares)	16,601	3,368
Weighted average diluted shares outstanding (in shares)	3,917,114	3,896,094
Diluted earnings per common share (in dollars per share)	$ 0.27	$ 0.44

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