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Note 6 - Net Loss Per-share - Reconciliation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net income (loss)	$ (368)	$ (31)
Weighted-average shares of common stock outstanding (in shares)	17,728	17,710
Basic net income (loss) per share (in dollars per share)	$ (0.02)	$ 0
Less interest expense on convertible debt
Total	$ (368)	$ (31)
Dilutive options and warrants outstanding (in shares)
Number of shares used in diluted per-share computation (in shares)	17,728	17,710
Diluted net income (loss) per share (in dollars per share)	$ (0.02)	$ 0

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