Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Preferred Stock [Member] Series A Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2018	0	18,547,406
Balance at Dec. 31, 2018	$ 0	$ 19	$ 113,008	$ (98,395)	$ 14,632
Stock-based compensation	$ 0	$ 0	1,349	0	1,349
Stock option exercises (in shares)	0	236,061
Stock option exercises	$ 0	$ 0	462	0	462
Warrant exercises (in shares)		29,000
Warrant exercises		$ 0	538	0	538
Stock issued – on vested RSUs (in shares)	0	86,142
Stock issued – on vested RSUs	$ 0	$ 0	0	0	0
Net income	$ 0	$ 0	0	(14,909)	(14,909)
Balance (in shares) at Jun. 30, 2019	0	18,898,609
Balance at Jun. 30, 2019	$ 0	$ 19	115,357	(113,304)	2,072
Balance (in shares) at Mar. 31, 2019	0	18,717,095
Balance at Mar. 31, 2019	$ 0	$ 19	113,797	(117,556)	(3,740)
Stock-based compensation	$ 0	$ 0	818	0	818
Stock option exercises (in shares)	0	136,364
Stock option exercises	$ 0	$ 0	301	0	301
Warrant exercises (in shares)		24,000
Warrant exercises		$ 0	441	0	441
Stock issued – on vested RSUs (in shares)	0	21,150
Stock issued – on vested RSUs	$ 0	$ 0	0	0	0
Net income	$ 0	$ 0	0	4,252	4,252
Balance (in shares) at Jun. 30, 2019	0	18,898,609
Balance at Jun. 30, 2019	$ 0	$ 19	115,357	(113,304)	2,072
Balance (in shares) at Dec. 31, 2019	0	20,825,452
Balance at Dec. 31, 2019	$ 0	$ 21	143,485	(100,052)	43,454
Stock issued as 2019 bonus payout	$ 0	$ 0	314	0	314
Sale of common stock, net of fees (in shares)	0	1,904,762
Sale of common stock, net of fees	$ 0	$ 2	19,912	0	19,914
Stock-based compensation	$ 0	$ 0	2,258	0	2,258
Stock option exercises (in shares)	0	410,793
Stock option exercises	$ 0	$ 0	783	0	783
Cashless exercises of 3,871,405 warrants (in shares)	0	2,747,970
Cashless exercises of warrants	$ 0	$ 3	33,108	0	33,111
Warrant exercises (in shares)		5,000
Warrant exercises		$ 0	81	0	81
Stock issued – on vested RSUs (in shares)	0	88,390
Stock issued – on vested RSUs	$ 0	$ 0	0	0	0
Net income	$ 0	$ 0	0	5,928	5,928
Balance (in shares) at Jun. 30, 2020	0	25,982,367
Balance at Jun. 30, 2020	$ 0	$ 26	199,941	(94,124)	105,843
Balance (in shares) at Mar. 31, 2020	0	21,148,771
Balance at Mar. 31, 2020	$ 0	$ 21	145,432	(77,744)	67,709
Sale of common stock, net of fees (in shares)	0	1,904,762
Sale of common stock, net of fees	$ 0	$ 2	19,912	0	19,914
Stock-based compensation	$ 0	$ 0	1,145	0	1,145
Stock option exercises (in shares)	0	142,500
Stock option exercises	$ 0	$ 0	293	0	293
Cashless exercises of 3,871,405 warrants (in shares)	0	2,747,970
Cashless exercises of warrants	$ 0	$ 3	33,108	0	33,111
Warrant exercises (in shares)		3,000
Warrant exercises		$ 0	51	0	51
Stock issued – on vested RSUs (in shares)	0	35,364
Stock issued – on vested RSUs	$ 0	$ 0	0	0	0
Net income	$ 0	$ 0	0	(16,380)	(16,380)
Balance (in shares) at Jun. 30, 2020	0	25,982,367
Balance at Jun. 30, 2020	$ 0	$ 26	$ 199,941	$ (94,124)	$ 105,843