Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2017	51,094,000
Balance at Dec. 31, 2017	$ 255	$ 19,571	$ (11,601)	$ 8,225
Additional warrant financing costs		(10)		(10)
Stock-based compensation, net of issuance costs		73		$ 73
Cashless option exercise (in shares)	66,000			181,668
Cashless option exercise
Net income			2,041	2,041
Balance (in shares) at Mar. 31, 2018	51,160,000
Balance at Mar. 31, 2018	$ 255	19,634	(9,560)	10,329
Balance (in shares) at Dec. 31, 2018	54,286,000
Balance at Dec. 31, 2018	$ 271	21,797	(17,466)	4,602
Stock-based compensation, net of issuance costs		92		$ 92
Cashless option exercise (in shares)				0
Net income			4,303	$ 4,303
Restricted share cancellation (in shares)	(55,000)
Restricted share cancellation
Balance (in shares) at Mar. 31, 2019	54,231,000
Balance at Mar. 31, 2019	$ 271	$ 21,889	$ (13,163)	$ 8,997