Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Dec. 31, 2016	51,477
Balance, beginning at Dec. 31, 2016	$ 515	$ 159,474	$ 752	$ (2,910)	$ 1,045	$ 158,876
Total comprehensive income (loss)			(6,101)	939	(129)	(5,291)
Cumulative effect of new accounting principles adopted		(1,278)	1,345			67
Reclassification of certain deferred income tax effects			425	(425)
Stock compensation		1,509				1,509
Extinguishment of convertible note options		(360)				(360)
Surrender of shares to cover minimum withholding taxes on stock-based compensation		(605)				(605)
Issuance of common stock, pursuant to stock plans, $.01 par (in shares)	1,049
Issuance of common stock, pursuant to stock plans, $.01 par	$ 10	229				239
Contributions from noncontrolling interest					75	75
Balance (in shares) at Dec. 31, 2017	52,526
Balance, ending at Dec. 31, 2017	$ 525	158,969	(3,579)	(2,396)	991	154,510
Total comprehensive income (loss)			9,080	(279)	(92)	8,709
Cumulative effect of new accounting principles adopted			4,938			4,938
Stock compensation		1,757				1,757
Surrender of shares to cover minimum withholding taxes on stock-based compensation		(415)				(415)
Issuance of common stock, pursuant to stock plans, $.01 par (in shares)	742
Issuance of common stock, pursuant to stock plans, $.01 par	$ 8	203				211
Contributions from noncontrolling interest					40	40
Balance (in shares) at Dec. 31, 2018	53,268
Balance, ending at Dec. 31, 2018	$ 533	$ 160,514	$ 10,439	$ (2,675)	$ 939	$ 169,750