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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net loss	$ (2,163)	$ (820)	$ (4,009)	$ (1,288)
Basic weighted average shares outstanding (in shares)	8,301,094	8,638,091	8,304,093	8,702,743
Dilutive common stock equivalents using treasury stock method (in shares)
Diluted weighted average shares outstanding (in shares)	8,301,094	8,638,091	8,304,093	8,702,743
Basic loss per common share (in dollars per share)	$ (0.26)	$ (0.09)	$ (0.48)	$ (0.15)
Diluted loss per common share (in dollars per share)	$ (0.26)	$ (0.09)	$ (0.48)	$ (0.15)
Weighted average options outstanding (in shares)	724,373	869,838	736,160	858,845
Anti-dilutive options not included in the computations (in shares)	724,373	869,838	736,160	858,845

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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