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Note 3 - Earnings (Loss) Per Share - Computation of Basic and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net loss	$ (1,846)	$ (468)
Basic weighted average shares outstanding (in shares)	8,307,125	8,768,112
Dilutive common stock equivalents using treasury stock method (in shares)
Diluted weighted average shares outstanding (in shares)	8,307,125	8,768,112
Basic loss per common share (in dollars per share)	$ (0.22)	$ (0.05)
Diluted loss per common share (in dollars per share)	$ (0.22)	$ (0.05)
Weighted average options outstanding (in shares)	748,078	847,731
Anti-dilutive options not included in the computations (in shares)	748,078	847,731

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