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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Basic and diluted earnings
Net income (loss)	$ 113	$ (457)
Weighted average outstanding shares of common stock	6,586	6,543
Dilutive potential common shares from stock options and restricted stock units	13	38
Common stock and common stock equivalents	6,599	6,581
Earnings per share:
Shares subject to anti-dilutive stock options and restricted stock-based awards excluded from calculation	3	3
Earnings (loss) per share, basic	$ 0.02	$ (0.07)
Earnings (loss) per share, diluted	$ 0.02	$ (0.07)

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