Consolidated Statements of Stockholders' Equity (Unaudited) - 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
Stock-based compensation, net of issuance costs		63		73
Cashless option exercise (in shares)	66,000
Cashless option exercise
Net income (loss)			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, 2017	51,094,000
Balance at Dec. 31, 2017	$ 255	19,571	(11,601)	$ 8,225
Cashless option exercise (in shares)				1,230,002
Net income (loss)				$ (1,241)
Balance (in shares) at Jun. 30, 2018	54,426,000
Balance at Jun. 30, 2018	$ 271	21,594	(12,842)	9,023
Balance (in shares) at Mar. 31, 2018	51,160,000
Balance at Mar. 31, 2018	$ 255	19,634	(9,560)	10,329
Stock-based compensation, net of issuance costs		105		105
Cashless option exercise (in shares)	663,000
Cashless option exercise	$ 3	(3)
Net income (loss)			(3,282)	(3,282)
Restricted share issuance (in shares)	990,000
Restricted share issuance	$ 5	(5)
Cashless exercise of warrants (in shares)	1,613,000
Cashless exercise of warrants	$ 8	1,863		1,871
Balance (in shares) at Jun. 30, 2018	54,426,000
Balance at Jun. 30, 2018	$ 271	21,594	(12,842)	9,023
Balance (in shares) at Dec. 31, 2018	54,286,000
Balance at Dec. 31, 2018	$ 271	21,797	(17,466)	4,602
Net income (loss)			4,303	4,303
Opening balance adjustment			108	108
Stock-based compensation, net of issuance costs		92		92
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	(13,055)	9,105
Balance (in shares) at Dec. 31, 2018	54,286,000
Balance at Dec. 31, 2018	$ 271	21,797	(17,466)	$ 4,602
Cashless option exercise (in shares)				0
Net income (loss)				$ 1,094
Balance (in shares) at Jun. 30, 2019	55,329,000
Balance at Jun. 30, 2019	$ 277	21,960	(16,264)	5,973
Balance (in shares) at Mar. 31, 2019	54,231,000
Balance at Mar. 31, 2019	$ 271	21,889	(13,055)	9,105
Net income (loss)			(3,209)	(3,209)
Restricted share issuance (in shares)	1,123,000
Restricted share issuance	$ 6	(6)
Stock-based compensation, net of issuance costs		77		77
Restricted share cancellation (in shares)	(25,000)
Restricted share cancellation
Balance (in shares) at Jun. 30, 2019	55,329,000
Balance at Jun. 30, 2019	$ 277	$ 21,960	$ (16,264)	$ 5,973