Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2017	165,889,901
Balance at Dec. 31, 2017	$ 1,659	$ 415,471	$ (310,822)	$ 106,308
Net income			2,002	2,002
Stock-based compensation		1,894		1,894
Stock options exercised	$ 1	13		14
Restricted stock issued, net of forfeitures (in shares)	572,517
Restricted stock issued, net of forfeitures	$ 6	(6)
Balance at Sep. 30, 2018	$ 1,666	417,372	(308,820)	110,218
Stock options exercised (in shares)	147,400
Balance (in shares) at Sep. 30, 2018	166,609,818
Balance (in shares) at Jun. 30, 2018	166,711,210
Balance at Jun. 30, 2018	$ 416,944	(310,597)	1,667	108,014
Net income		1,777		1,777
Stock-based compensation	428			428
Stock options exercised			(1)	(1)
Restricted stock issued, net of forfeitures (in shares)	(103,539)
Restricted stock issued, net of forfeitures
Balance at Sep. 30, 2018	$ 1,666	417,372	(308,820)	$ 110,218
Stock options exercised (in shares)	2,147
Balance (in shares) at Sep. 30, 2018	166,609,818
Balance (in shares) at Dec. 31, 2018	166,713,784			166,713,784
Balance at Dec. 31, 2018	$ 1,667	417,844	(253,001)	$ 166,510
Net income			3,264	3,264
Stock-based compensation		1,398		1,398
Stock options exercised	$ 4	397		401
Restricted stock issued, net of forfeitures (in shares)	1,262,490
Restricted stock issued, net of forfeitures	$ 13	(13)
Balance at Sep. 30, 2019	$ 1,684	419,626	(249,737)	$ 171,573
Stock options exercised (in shares)	423,369
Balance (in shares) at Sep. 30, 2019	168,399,643			168,399,643
Balance (in shares) at Jun. 30, 2019	168,452,060
Balance at Jun. 30, 2019	$ 1,684	419,122	(266,778)	$ 154,028
Net income			17,041	17,041
Stock-based compensation		504		504
Stock options exercised
Restricted stock issued, net of forfeitures (in shares)	(52,417)
Restricted stock issued, net of forfeitures
Balance at Sep. 30, 2019	$ 1,684	$ 419,626	$ (249,737)	$ 171,573
Balance (in shares) at Sep. 30, 2019	168,399,643			168,399,643