Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Dec. 31, 2018	20,058,904
Balance at Dec. 31, 2018	$ 201	$ 193,132	$ 46,621	$ 239,954	$ 76	$ 240,030
Net loss	0	0	(415)	(415)	19	(396)
Stock-based compensation expense	$ 0	1,089	0	1,089	0	1,089
Shares issued through stock plans (in shares)	277,401
Shares issued through stock plans	$ 2	(2)	0	0	0	0
Shares net settled with the Company to satisfy employee personal income tax liabilities resulting from share based compensation plans (in shares)	(85,420)
Shares net settled with the Company to satisfy employee personal income tax liabilities resulting from share based compensation plans	$ 0	(488)	0	(488)	0	$ (488)
Repurchase of common stock (in shares)	(153,916)					(153,916)
Repurchase of common stock	$ (2)	(1,040)	0	(1,042)	0	$ (1,042)
Balance (in shares) at Jun. 30, 2019	20,096,969
Balance at Jun. 30, 2019	$ 201	192,691	46,206	239,098	95	239,193
Balance (in shares) at Mar. 31, 2019	20,049,113
Balance at Mar. 31, 2019	$ 200	192,169	44,634	237,003	76	237,079
Net loss	0	0	1,572	1,572	19	1,591
Stock-based compensation expense	$ 0	523	0	523	0	523
Shares issued through stock plans (in shares)	47,856
Shares issued through stock plans	$ 1	(1)	0	0	0	0
Balance (in shares) at Jun. 30, 2019	20,096,969
Balance at Jun. 30, 2019	$ 201	192,691	46,206	239,098	95	$ 239,193
Balance (in shares) at Dec. 31, 2019	20,096,969					20,096,969
Balance at Dec. 31, 2019	$ 201	193,862	38,584	232,647	112	$ 232,759
Net loss	0	0	(32,769)	(32,769)	0	(32,769)
Stock-based compensation expense	$ 0	1,110	0	1,110	0	1,110
Shares issued through stock plans (in shares)	244,812
Shares issued through stock plans	$ 2	(2)	0	0	0	0
Shares net settled with the Company to satisfy employee personal income tax liabilities resulting from share based compensation plans (in shares)	(58,644)
Shares net settled with the Company to satisfy employee personal income tax liabilities resulting from share based compensation plans	$ 0	(304)	0	(304)	0	$ (304)
Repurchase of common stock (in shares)	(2,051,183)					(2,051,183)
Repurchase of common stock	$ (21)	(3,697)	0	(3,718)	0	$ (3,718)
Balance (in shares) at Jun. 30, 2020	18,231,954					18,231,954
Balance at Jun. 30, 2020	$ 182	190,969	5,815	196,966	112	$ 197,078
Balance (in shares) at Mar. 31, 2020	18,957,165
Balance at Mar. 31, 2020	$ 190	191,926	30,108	222,224	112	222,336
Net loss	0	0	(24,293)	(24,293)	0	(24,293)
Stock-based compensation expense	$ 0	521	0	521	0	521
Shares issued through stock plans (in shares)	92,635
Shares issued through stock plans	$ 1	(1)	0	0	0	0
Shares net settled with the Company to satisfy employee personal income tax liabilities resulting from share based compensation plans (in shares)	(546)
Shares net settled with the Company to satisfy employee personal income tax liabilities resulting from share based compensation plans	$ 0	(1)	0	(1)	0	$ (1)
Repurchase of common stock (in shares)	(817,300)					(817,300)
Repurchase of common stock	$ (9)	(1,476)	0	(1,485)	0	$ (1,485)
Balance (in shares) at Jun. 30, 2020	18,231,954					18,231,954
Balance at Jun. 30, 2020	$ 182	$ 190,969	$ 5,815	$ 196,966	$ 112	$ 197,078