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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income (loss)	$ 583	$ 3,916	$ 4,038	$ 2,125	$ 7,860	$ (259)	$ 1,228	$ (1,219)	$ 10,662	$ 7,610	$ (5,347)
Denominator:
Weighted average number of shares of common stock outstanding									8,132,632	7,225,697	7,193,300
Weighted average effect of dilutive stock options and other share-based compensation									215,060	149,108
Weighted average number of shares of common stock outstanding, as adjusted									8,347,692	7,374,805	7,193,300
Net income (loss) per common share:
Basic earnings (loss) per share	$ 0.07	$ 0.45	$ 0.52	$ 0.29	$ 1.09	$ (0.04)	$ 0.17	$ (0.17)	$ 1.31	$ 1.05	$ (0.74)
Diluted earnings (loss) per share	$ 0.07	$ 0.44	$ 0.50	$ 0.28	$ 1.06	$ (0.04)	$ 0.17	$ (0.17)	$ 1.28	$ 1.03	$ (0.74)