Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2019	20,825,452
Balance at Dec. 31, 2019	$ 21	$ 143,485	$ (100,052)	$ 43,454
Stock issued as 2019 bonus payout	0	314	0	314
Stock based compensation	$ 0	1,113	0	1,113
Stock option exercises (in shares)	268,293
Stock option exercises	$ 0	490	0	490
Warrant exercises (in shares)	2,000
Warrant exercises	$ 0	30	0	30
Stock issued – on vested RSUs (in shares)	53,026
Stock issued – on vested RSUs	$ 0	0	0	0
Net income (loss)	$ 0	0	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
Balance (in shares) at Dec. 31, 2020	33,039,146
Balance at Dec. 31, 2020	$ 33	302,598	(97,385)	205,246
Stock based compensation	$ 0	1,505	0	1,505
Stock option exercises (in shares)	162,865
Stock option exercises	$ 0	243	0	243
Stock issued – on vested RSUs (in shares)	362,153
Stock issued – on vested RSUs	$ 0	0	0	0
Net income (loss)	$ 0	0	(1,118)	(1,118)
Cashless exercises of warrants (in shares)	70,030
Cashless exercises of warrants	$ 1	2,900	0	2,901
Balance (in shares) at Mar. 31, 2021	33,634,194
Balance at Mar. 31, 2021	$ 34	$ 307,246	$ (98,503)	$ 208,777