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Note 8 - Earnings Per Share - Computation of Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic earnings per share:
Net income attributable to Common shareholders	$ 769	$ 1,013	$ 2,870	$ 3,547
Weighted average shares outstanding (in shares)	3,904,751	3,894,237	3,903,056	3,893,702
Basic earnings per common share (in dollars per share)	$ 0.20	$ 0.26	$ 0.74	$ 0.91
Diluted earnings per share:
Net income attributable to Common shareholders	$ 769	$ 1,013	$ 2,870	$ 3,547
Weighted average shares outstanding (in shares)	3,904,751	3,894,237	3,903,056	3,893,702
Effect of potentially dilutive restricted common shares (in shares)	14,067	9,193	17,974	4,854
Weighted average diluted shares outstanding (in shares)	3,918,818	3,903,430	3,921,030	3,898,556
Diluted earnings per common share (in dollars per share)	$ 0.20	$ 0.26	$ 0.73	$ 0.91

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