Net (loss) Income Per Common Share (Computation of Basic and Diluted Net Income Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net (loss) income	$ (7,000)	$ 767	$ (11,742)	$ 4,075
Denominator:
Weighted average number of shares of common stock outstanding	8,829,732	8,787,837	8,813,880	8,780,590
Weighted average effect of dilutive share-based compensation		91,604		89,650
Diluted weighted average number of shares of common stock outstanding	8,829,732	8,879,441	8,813,880	8,870,240
Net (loss) income per common share:
Net (loss) income per common share - Basic	$ (0.79)	$ 0.09	$ (1.33)	$ 0.46
Net (loss) income per common share - Diluted	$ (0.79)	$ 0.09	$ (1.33)	$ 0.46