CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2017	$ 210	$ 76,802	$ (42,870)	$ (1,471)	$ (2,999)	$ 29,672
Balance (in shares) at Dec. 31, 2017	21,024,395				(1,598,911)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense		1,370				1,370
Common stock issued for options exercised (in shares)	213,763
Common stock issued for options exercised	$ 2	37				39
Common stock issued for RSUs vested (in shares)	193,856
Common stock issued for RSUs vested	$ 2	(2)				0
Shares withheld to pay taxes		(331)				(331)
Foreign currency translation adjustment				(258)		(258)
Net income (loss)			(1,033)			(1,033)
Balance at Sep. 30, 2018	$ 214	77,876	(43,248)	(1,729)	$ (2,999)	30,114
Balance (in shares) at Sep. 30, 2018	21,432,014				(1,598,911)
Balance at Jun. 30, 2018	$ 213	77,611	(42,730)	(1,698)	$ (2,999)	30,397
Balance (in shares) at Jun. 30, 2018	21,310,806				(1,598,911)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense		402				402
Common stock issued for options exercised (in shares)	84,250
Common stock issued for options exercised	$ 0	(56)				(56)
Common stock issued for RSUs vested (in shares)	36,958
Common stock issued for RSUs vested	$ 1	0				1
Shares withheld to pay taxes		(81)				(81)
Foreign currency translation adjustment				(31)		(31)
Net income (loss)			(518)			(518)
Balance at Sep. 30, 2018	$ 214	77,876	(43,248)	(1,729)	$ (2,999)	30,114
Balance (in shares) at Sep. 30, 2018	21,432,014				(1,598,911)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adopting ASC 606			655			655
Balance at Dec. 31, 2018	$ 214	78,118	(42,569)	(1,635)	$ (2,999)	31,129
Balance (in shares) at Dec. 31, 2018	21,485,445				(1,598,911)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense		1,238				1,238
Common stock issued for options exercised (in shares)	9,011
Common stock issued for options exercised	$ 1	89				90
Common stock issued for RSUs vested (in shares)	294,000
Common stock issued for RSUs vested	$ 3	(3)				0
Shares withheld to pay taxes		(304)				(304)
Foreign currency translation adjustment				(149)		(149)
Net income (loss)			(5,482)			(5,482)
Balance at Sep. 30, 2019	$ 218	79,138	(48,050)	(1,784)	$ (2,999)	26,523
Balance (in shares) at Sep. 30, 2019	21,788,525				(1,598,911)
Balance at Jun. 30, 2019	$ 217	79,028	(46,930)	(1,695)	$ (2,999)	27,622
Balance (in shares) at Jun. 30, 2019	21,698,635				(1,598,911)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense		169				169
Common stock issued for options exercised (in shares)	0
Common stock issued for options exercised	$ 0	15				15
Common stock issued for RSUs vested (in shares)	89,890
Common stock issued for RSUs vested	$ 1	(1)				0
Shares withheld to pay taxes		(73)				(73)
Foreign currency translation adjustment				(89)		(89)
Net income (loss)			(1,121)			(1,121)
Balance at Sep. 30, 2019	$ 218	$ 79,138	$ (48,050)	$ (1,784)	$ (2,999)	$ 26,523
Balance (in shares) at Sep. 30, 2019	21,788,525				(1,598,911)