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		18,547,406
Balance at Dec. 31, 2018		$ 19	$ 113,008	$ (98,395)	$ 14,632
Stock-based compensation			531		531
Stock option exercises (in shares)		99,697
Stock option exercises			161		161
Warrant exercises (in shares)		5,000
Warrant exercises			97		97
Stock issued – on vested RSUs (in shares)		64,992
Stock issued – on vested RSUs
Net loss				(19,161)	(19,161)
Net income				(19,161)	(19,161)
Balance (in shares) at Mar. 31, 2019		18,717,095
Balance at Mar. 31, 2019		$ 19	113,797	(117,556)	(3,740)
Balance (in shares) at Dec. 31, 2019		20,825,452
Balance at Dec. 31, 2019		$ 21	143,485	(100,052)	43,454
Stock-based compensation			1,113		1,113
Stock option exercises (in shares)		268,293
Stock option exercises			490		490
Warrant exercises (in shares)		2,000
Warrant exercises			30		30
Stock issued – on vested RSUs (in shares)		53,026
Stock issued – on vested RSUs
Net loss				22,308	22,308
Stock issued as 2019 bonus payout			314		314
Net income				22,308	22,308
Balance (in shares) at Mar. 31, 2020		21,148,771
Balance at Mar. 31, 2020		$ 21	$ 145,432	$ (77,744)	$ 67,709