CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings	Non-Controlling Interest [Member]	Total
Balance at Dec. 31, 2019	$ 34	$ 9,198	$ (3,846)	$ 14,356	$ (89)	$ 19,653
Balance (in shares) at Dec. 31, 2019	32,791,665
Exercised and vested stock-based awards		221				221
Exercised and vested stock-based awards (in shares)	385,917
Stock-based compensation expense		497				497
Net income				2,937		2,937
Balance at Mar. 31, 2020	$ 34	9,916	(3,846)	17,293	(89)	23,308
Balance (in shares) at Mar. 31, 2020	33,177,582
Exercised and vested stock-based awards		53				53
Exercised and vested stock-based awards (in shares)	157,414
Stock-based compensation expense		579				579
Net income				3,017		3,017
Balance at Jun. 30, 2020	$ 34	10,548	(3,846)	20,310	(89)	26,957
Balance (in shares) at Jun. 30, 2020	33,334,996
Stock issued for public offering	$ 1	25,239				25,240
Stock issued for public offering ( shares)	1,250,000
Exercised and vested stock-based awards		(38)				(38)
Exercised and vested stock-based awards (in shares)	152,269
Stock-based compensation expense		730				730
Net income				1,333		1,333
Balance at Sep. 30, 2020	$ 35	36,479	(3,846)	21,643	$ (89)	54,222
Balance (in shares) at Sep. 30, 2020	34,737,265
Balance at Dec. 31, 2020	$ 36	37,235	(3,846)	23,430		56,855
Balance (in shares) at Dec. 31, 2020	34,791,931
Exercised and vested stock-based awards	$ 1	29				30
Exercised and vested stock-based awards (in shares)	57,769
Stock-based compensation expense		108				108
Shares of common stock withheld to pay taxes on employees' equity awards		(59)				(59)
Shares of common stock withheld to pay taxes on employees' equity awards (in shares)	(3,758)
Warrants exercised (in shares)	8,848
Treasury stock			(75)			(75)
Treasury stock (in shares)	(5,000)
Net income				(706)		(706)
Balance at Mar. 31, 2021	$ 37	37,313	(3,921)	22,724		56,153
Balance (in shares) at Mar. 31, 2021	34,849,790
Balance at Dec. 31, 2020	$ 36	37,235	(3,846)	23,430		56,855
Balance (in shares) at Dec. 31, 2020	34,791,931
Treasury stock	$ (2,700)
Treasury stock (in shares)	(175,179)
Balance at Sep. 30, 2021	$ 37	38,220	(6,513)	31,639		63,383
Balance (in shares) at Sep. 30, 2021	34,774,723
Balance at Mar. 31, 2021	$ 37	37,313	(3,921)	22,724		56,153
Balance (in shares) at Mar. 31, 2021	34,849,790
Exercised and vested stock-based awards		59				59
Exercised and vested stock-based awards (in shares)	85,190
Stock-based compensation expense		401				401
Shares of common stock withheld to pay taxes on employees' equity awards		(76)				(76)
Shares of common stock withheld to pay taxes on employees' equity awards (in shares)	(31,902)
Treasury stock			(2,045)			(2,045)
Treasury stock (in shares)	(135,179)
Net income				2,808		2,808
Balance at Jun. 30, 2021	$ 37	37,697	(5,966)	25,532		57,300
Balance (in shares) at Jun. 30, 2021	34,767,899
Exercised and vested stock-based awards		38				38
Exercised and vested stock-based awards (in shares)	45,165
Stock-based compensation expense		533				533
Shares of common stock withheld to pay taxes on employees' equity awards		(48)				(48)
Shares of common stock withheld to pay taxes on employees' equity awards (in shares)	(3,341)
Treasury stock			(547)			(547)
Treasury stock (in shares)	(35,000)
Net income				6,107		6,107
Balance at Sep. 30, 2021	$ 37	$ 38,220	$ (6,513)	$ 31,639		$ 63,383
Balance (in shares) at Sep. 30, 2021	34,774,723