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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, 2019	Mar. 31, 2018
Net loss	$ (2,349)	$ (1,846)
Basic weighted average shares outstanding (in shares)	16,630,597	8,307,125
Dilutive common stock equivalents using treasury stock method (in shares)
Diluted weighted average shares outstanding (in shares)	16,630,597	8,307,125
Basic loss per common share (in dollars per share)	$ (0.14)	$ (0.22)
Diluted loss per common share (in dollars per share)	$ (0.14)	$ (0.22)
Weighted average options outstanding (in shares)	587,184	748,078
Anti-dilutive options not included in the computations (in shares)	587,184	748,078

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