Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net income	$ 3,120	$ 2,502
Denominator:
Weighted average common shares - basic (in shares)	11,914,000	12,462,000
Effect of dilutive securities: stock options (in shares)	310,000	0
Weighted average common shares - diluted (in shares)	12,224,000	12,462,000
Net income per share - basic (in dollars per share)	$ 0.26	$ 0.20
Net income per share - diluted (in dollars per share)	$ 0.26	$ 0.20
Anti-dilutive shares not included in computation of net income (loss) per common share (in shares)	150,000	950,000