Consolidated Condensed Statements Of Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Loss [Member]	Non-Controlling Interest [Member]	Total
Balance at Dec. 31, 2017	$ 6,900	$ 21,581	$ (6,056)	$ (733)	$ (253)	$ 21,439
Balance, shares at Dec. 31, 2017	6,900
Exercise of stock options, net	$ 41	167				208
Exercise of stock options, net, shares	41
Shares issued under the employee stock purchase plan	$ 3	57				60
Shares issued under the employee stock purchase plan, shares	3
Stock-based compensation		333				333
Net income (loss)			757			757
Comprehensive income (loss)				86		86
Balance at Mar. 31, 2018	$ 6,944	22,138	(5,299)	(647)	(253)	22,883
Balance, shares at Mar. 31, 2018	6,944
Balance at Dec. 31, 2017	$ 6,900	21,581	(6,056)	(733)	(253)	21,439
Balance, shares at Dec. 31, 2017	6,900
Net income (loss)						4,679
Balance at Sep. 30, 2018	$ 8,640	84,510	(1,404)	(889)	(253)	90,604
Balance, shares at Sep. 30, 2018	8,640
Balance at Mar. 31, 2018	$ 6,944	22,138	(5,299)	(647)	(253)	22,883
Balance, shares at Mar. 31, 2018	6,944
Exercise of stock options, net	$ 92	(37)				55
Exercise of stock options, net, shares	92
Shares issued under the employee stock purchase plan	$ 1	54				55
Shares issued under the employee stock purchase plan, shares	1
Stock-based compensation		334				334
Net income			1,992			1,992
Comprehensive income (loss)				(252)		(252)
Balance at Jun. 30, 2018	$ 7,037	22,489	(3,307)	(899)	(253)	25,067
Balance, shares at Jun. 30, 2018	7,037
Exercise of stock options, net	$ 377	(227)				150
Exercise of stock options, net, shares	377
Shares issued under the employee stock purchase plan	$ 1	55				56
Shares issued under the employee stock purchase plan, shares	1
Withholding of common stock upon vesting of restricted stock units	$ 1,725	87,242				88,967
Withholding of common stock upon vesting of restricted stock units, shares	1,725
Repurchase of common stock	$ (500)	(25,407)				(25,907)
Repurchase of common stock, shares	(500)
Stock-based compensation		358				358
Net income (loss)			1,903			1,903
Comprehensive income (loss)				10		10
Balance at Sep. 30, 2018	$ 8,640	84,510	(1,404)	(889)	(253)	90,604
Balance, shares at Sep. 30, 2018	8,640
Balance at Dec. 31, 2018	$ 8,664	84,999	(509)	(927)	(253)	91,974
Balance, shares at Dec. 31, 2018	8,664
Exercise of stock options, net	$ 27	(9)				18
Exercise of stock options, net, shares	27
Shares issued under the employee stock purchase plan	$ 3	67				70
Shares issued under the employee stock purchase plan, shares	3
Withholding of common stock upon vesting of restricted stock units	$ 20
Withholding of common stock upon vesting of restricted stock units		(255)				(235)
Withholding of common stock upon vesting of restricted stock units, shares	20
Stock-based compensation		329				329
Net income (loss)			775			775
Comprehensive income (loss)				130		130
Balance at Mar. 31, 2019	$ 8,714	85,131	266	(797)	(253)	93,061
Balance, shares at Mar. 31, 2019	8,714
Balance at Dec. 31, 2018	$ 8,664	84,999	(509)	(927)	(253)	$ 91,974
Balance, shares at Dec. 31, 2018	8,664
Exercise of stock options, net, shares						128
Net income (loss)						$ (4,544)
Balance at Sep. 30, 2019	$ 8,778	86,358	(5,054)	(524)	(253)	89,305
Balance, shares at Sep. 30, 2019	8,778
Balance at Mar. 31, 2019	$ 8,714	85,131	266	(797)	(253)	93,061
Balance, shares at Mar. 31, 2019	8,714
Exercise of stock options, net	$ 29	22				51
Exercise of stock options, net, shares	29
Shares issued under the employee stock purchase plan	$ 2	48				50
Shares issued under the employee stock purchase plan, shares	2
Withholding of common stock upon vesting of restricted stock units	$ 6
Withholding of common stock upon vesting of restricted stock units		(6)
Withholding of common stock upon vesting of restricted stock units, shares	6
Stock-based compensation	$ 3	534				537
Stock-based compensation, shares	3
Net income (loss)			(5,030)			(5,030)
Comprehensive income (loss)				259		259
Balance at Jun. 30, 2019	$ 8,754	85,729	(4,764)	(538)	(253)	88,928
Balance, shares at Jun. 30, 2019	8,754
Exercise of stock options, net	$ 12	16				28
Exercise of stock options, net, shares	12
Shares issued under the employee stock purchase plan	$ 2	44				46
Shares issued under the employee stock purchase plan, shares	2
Withholding of common stock upon vesting of restricted stock units	$ 10
Withholding of common stock upon vesting of restricted stock units		(79)				(69)
Withholding of common stock upon vesting of restricted stock units, shares	10
Stock-based compensation		648				648
Net income (loss)			(290)			(290)
Comprehensive income (loss)				14		14
Balance at Sep. 30, 2019	$ 8,778	$ 86,358	$ (5,054)	$ (524)	$ (253)	$ 89,305
Balance, shares at Sep. 30, 2019	8,778