CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (1,202)	$ (13,817)	$ 675
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Impairment of long-lived assets, net	0	113	221
Provision for doubtful accounts	818	215	305
Depreciation and amortization	9,806	8,634	4,808
Share-based compensation expense	2,170	2,218	3,217
(Gain) loss on sale of property and equipment	(3,990)	284	149
Deferred income taxes	(18)	14,134	766
Purchase of trading investment securities	(165)	(501)	(429)
Proceeds from sale of trading investment securities	775	151	147
Realized and unrealized gains on investments	87	(216)	(63)
Foreign exchange losses (gains)	1,697	(1,980)	1,348
Changes in assets and liabilities:
Accounts receivable	189	(1,241)	(343)
Inventories	1,066	5,177	(9,569)
Prepaid expenses and other	(821)	(1,191)	2,442
Other assets	814	2,391	(3,025)
Accounts payable	1,035	(1,123)	(935)
Accrued volume incentives and service fees	1,762	1,884	1,477
Accrued liabilities	10,045	(986)	1,519
Deferred revenue	(357)	(324)	(488)
Income taxes payable	1,297	(1,758)	1,924
Liability related to unrecognized tax positions	(2,501)	(2,129)	(1,076)
Deferred compensation payable	(674)	589	347
Net cash provided by operating activities	21,833	10,524	3,417
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(4,834)	(5,501)	(11,028)
Proceeds from sale of property, plant and equipment	5,045	521	0
Proceeds from sale/maturities of investments available for sale	0	1,776	5
Purchase of intangible assets	0	0	(509)
Net cash provided by (used in) investing activities	211	(3,204)	(11,532)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments of cash dividends	0	(1,848)	(7,509)
Proceeds from new revolving credit facility	68,322	19,184	0
Principal payments of new revolving credit facility	(81,503)	(6,003)	0
Net borrowings on original revolving credit facility	0	(9,919)	7,223
Proceeds from borrowings from related party	1,000	506	0
Proceeds from exercise of stock options	664	(347)	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	(675)	0	0
Net cash provided by (used in) financing activities	(12,192)	1,573	(286)
Effect of exchange rates on cash and cash equivalents	(2,124)	1,733	(735)
Net increase (decrease) in cash and cash equivalents	7,728	10,626	(9,136)
Cash and cash equivalents at beginning of the year	42,910	32,284	41,420
Cash and cash equivalents at end of the year	50,638	42,910	32,284
Supplemental disclosure of cash flow information:
Cash paid for income taxes, net of refunds	3,535	4,597	3,589
Cash paid for interest	397	257	254
Supplemental disclosure of noncash investing and financing activities:
Purchases of property, plant and equipment included in accounts payable and accrued liabilities	$ 32	$ 63	$ 178