CONSOLIDATED STATEMENTS OF MEZZANINE AND STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock Outstanding	Additional Paid-in Capital	Retained Earnings	Noncontrolling Interest	Noncontrolling Interest Mezzanine
Equity, beginning balance at Dec. 31, 2019	$ 192,335	$ 36	$ 159,608	$ 31,905	$ 786	$ 168,725
Equity, beginning balance (in shares) at Dec. 31, 2019		35,908,057
Net income	4,147			4,052	95	(1,160)
Purchase of noncontrolling interest	0					(126)
Purchase of treasury shares (in shares)		(16,897)
Purchase of treasury shares	(301)		(301)
Shares issued for exercise of options and warrants (in shares)		151,601
Shares issued for exercise of options and warrants	722		722
Share-based compensation	1,058		1,058
Dividends	0					(10,000)
Equity, ending balance at Mar. 31, 2020	197,961	$ 36	161,087	35,957	881	157,439
Equity, ending balance (in shares) at Mar. 31, 2020		36,042,761
Equity, beginning balance at Dec. 31, 2020	330,911	$ 42	261,011	69,771	87	114,237
Equity, beginning balance (in shares) at Dec. 31, 2020		42,249,137
Net income	13,698			13,151	547	760
Purchase of noncontrolling interest	(75)				(75)	(150)
Purchase of treasury shares (in shares)		(34,158)
Purchase of treasury shares	(342)		(342)
Cancellation of restricted stock awards (in shares)		(5,281)
Cancellation of restricted stock awards	(144)		(144)
Shares issued for vesting of restricted stock awards (in shares)		7,689
Sales of noncontrolling interest	37				37
Shares issued for exercise of options and warrants (in shares)		421,002
Shares issued for exercise of options and warrants	4,256	$ 1	4,255
Share-based compensation	1,346		1,346
Equity, ending balance at Mar. 31, 2021	$ 349,687	$ 43	$ 266,126	$ 82,922	$ 596	$ 114,847
Equity, ending balance (in shares) at Mar. 31, 2021		42,638,389