Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 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, 2017	52,526
Balance, beginning at Dec. 31, 2017	$ 525	$ 158,969	$ (3,579)	$ (2,396)	$ 991	$ 154,510
Total comprehensive income			2,101	306	(32)	2,375
Stock compensation		242				242
Surrender of shares to cover minimum withholding taxes on stock-based compensation		(410)				(410)
Issuance of common stock, pursuant to stock plans, $.01 par (in shares)	585
Issuance of common stock, pursuant to stock plans, $.01 par	$ 6	(6)
Cumulative effect of new accounting principles adopted			4,938			4,938
Contributions from noncontrolling interest					40	40
Balance (in shares) at Mar. 31, 2018	53,111
Balance, ending at Mar. 31, 2018	$ 531	158,795	3,460	(2,090)	999	161,695
Balance (in shares) at Dec. 31, 2018	53,268
Balance, beginning at Dec. 31, 2018	$ 533	160,514	10,439	(2,675)	939	169,750
Total comprehensive income			227	(71)	(34)	122
Stock compensation		498				498
Surrender of shares to cover minimum withholding taxes on stock-based compensation		(305)				(305)
Issuance of common stock, pursuant to stock plans, $.01 par (in shares)	342
Issuance of common stock, pursuant to stock plans, $.01 par	$ 3	(3)
Balance (in shares) at Mar. 31, 2019	53,610
Balance, ending at Mar. 31, 2019	$ 536	$ 160,704	$ 10,666	$ (2,746)	$ 905	$ 170,065