Net Income (Loss) Per Share (Schedule Of Net Income Per Basic And Diluted Shares) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
NET INCOME (LOSS) PER SHARE [Abstract]
Net income (loss)	$ 503	$ (72)	$ 1,095	$ (214)	$ 6,086	$ 1,172	$ 2,041	$ 2,263	$ 1,312	$ 11,562	$ (2,089)
Weighted Average Shares Outstanding, Basic, shares									6,946	6,832	6,706
Weighted Average Shares Outstanding, Dilutive effect of common equivalent shares, shares									129	217	0
Weighted Average Shares Outstanding, Dilutive, shares									7,075	7,049	6,706
Per Share Amount, Basic (in usd per share)	$ 0.07	$ (0.01)	$ 0.16	$ (0.03)	$ 0.88	$ 0.17	$ 0.30	$ 0.33	$ 0.19	$ 1.69	$ (0.31)
Per Share Amount, Dilutive effect of common equivalent shares (in usd per share)									0	(0.05)	0
Per Share Amount, Dilutive (in usd per share)	$ 0.07	$ (0.01)	$ 0.15	$ (0.03)	$ 0.85	$ 0.16	$ 0.29	$ 0.33	$ 0.19	$ 1.64	$ (0.31)