Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Captal	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance at Mar. 31, 2018	$ 8,698	$ 52	$ 24,429	$ (311)	$ (15,472)
Balance (in shares) at Mar. 31, 2018		5,256,226
Stock-based compensation	85	$ 1	84
Stock-based compensation (in shares)		48,026
Stock for tax withholding	(10)		(10)
Stock for tax withholding (in shares)		(2,248)
Comprehensive income:
Foreign currency translation adjustment	(1)			(1)
Net income	(17)				(17)
Balance at Dec. 31, 2017	8,641	$ 51	24,355	(310)	(15,455)
Balance (in shares) at Dec. 31, 2017		5,210,448
Balance at Mar. 31, 2019	11,050	$ 52	24,592	(342)	(13,252)
Balance (in shares) at Mar. 31, 2019		5,293,941
Stock-based compensation	50		50
Stock-based compensation (in shares)		16,818
Stock options exercised	$ 4		4
Stock options exercised (in shares)	1,000	1,000
Stock for tax withholding	$ (12)		(12)
Stock for tax withholding (in shares)		(2,362)
Comprehensive income:
Foreign currency translation adjustment	30			30
Net income	308				308
Cumulative effect from adoption of ASU No. 2016-02	33				33
Balance at Dec. 31, 2018	$ 10,637	$ 52	$ 24,550	$ (372)	$ (13,593)
Balance (in shares) at Dec. 31, 2018	5,278,485