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		595				595
Common stock issued for options exercised (in shares)	109,513
Common stock issued for options exercised	$ 1	56				57
Common stock issued for RSUs vested (in shares)	81,976
Common stock issued for RSUs vested	$ 1	(1)				0
Shares withheld to pay taxes		(76)				(76)
Foreign currency translation adjustment				(45)		(45)
Net loss			(1,496)			(1,496)
Balance at Mar. 31, 2018	$ 212	77,376	(43,711)	(1,516)	$ (2,999)	29,362
Balance (in shares) at Mar. 31, 2018	21,215,884				(1,598,911)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adopting ASC 606			655			655
Cumulative effect of adopting ASC 606			0
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		570				570
Common stock issued for options exercised (in shares)	1,508
Common stock issued for options exercised	$ 1	41				42
Common stock issued for RSUs vested (in shares)	108,262
Common stock issued for RSUs vested	$ 1	(1)				0
Shares withheld to pay taxes		(150)				(150)
Foreign currency translation adjustment				(87)		(87)
Net loss			(4,236)			(4,236)
Balance at Mar. 31, 2019	$ 216	$ 78,578	$ (46,805)	$ (1,722)	$ (2,999)	$ 27,268
Balance (in shares) at Mar. 31, 2019	21,595,215				(1,598,911)