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Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income	$ 306	$ 1,328	$ 3,120	$ 118	$ 477	$ 2,502	$ 4,754	$ 3,097
Denominator:
Weighted average common shares - basic (in shares)	11,767,000			12,314,000			11,894,000	12,412,000
Effect of dilutive securities: stock options (in shares)	189,000			349,000			258,000	218,000
Weighted average common shares - diluted (in shares)	11,956,000			12,663,000			12,152,000	12,630,000
Net income per share - basic (in dollars per share)	$ 0.03			$ 0.01			$ 0.40	$ 0.25
Net income per share - diluted (in dollars per share)	$ 0.03			$ 0.01			$ 0.39	$ 0.25
Anti-dilutive shares not included in computation of net income (loss) per common share (in shares)	1,050,000			220,000			1,050,000	220,000

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