Net Income (Loss) Per Common Share (Computation of Basic and Diluted Net Income (Loss) Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net income	$ 200	$ 767	$ 2,086	$ 1,222	$ 583	$ 3,916	$ 4,038	$ 2,125	$ 4,275	$ 10,662	$ 7,610
Denominator:
Weighted average number of shares of common stock outstanding									8,778,753	8,132,632	7,225,697
Weighted average effect of dilutive share-based compensation									94,966	215,060	149,108
Diluted weighted average number of shares of common stock outstanding									8,873,719	8,347,692	7,374,805
Net income per common share:
Basic earnings per share	$ 0.02	$ 0.09	$ 0.24	$ 0.14	$ 0.07	$ 0.45	$ 0.52	$ 0.29	$ 0.49	$ 1.31	$ 1.05
Diluted earnings per share	$ 0.02	$ 0.09	$ 0.24	$ 0.14	$ 0.07	$ 0.44	$ 0.50	$ 0.28	$ 0.48	$ 1.28	$ 1.03