CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OPERATING ACTIVITIES:
Net income	$ 33,746	$ 23,016	$ 19,922
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation	7,745	6,147	4,828
(Gain) Loss on disposals of property and equipment	156	(608)	18
Deferred tax provision	568	(868)	3,219
Provision for doubtful accounts	214	86	(462)
Issuance of non-employee director shares	150	150	96
Changes in operating assets and liabilities:
Accounts receivable	(19,353)	(6,668)	(17,253)
Inventories	(23,865)	(2,844)	1,018
Other assets	60	8	(70)
Prepaid expenses	989	765	(3,361)
Accounts payable	19,425	(5,806)	12,931
Accrued liabilities	2,062	575	40
Net cash flows from operating activities	21,897	13,953	20,926
INVESTING ACTIVITIES:
Purchases of property, plant, and equipment	(13,342)	(24,693)	(25,026)
Proceeds from sale of property and equipment	141	1,303	3
Net cash flows from investing activities	(13,201)	(23,390)	(25,023)
FINANCING ACTIVITIES:
Net borrowings under credit facility	5,000	5,000	5,000
Payments of cash dividends	(8,200)	(8,188)	(7,715)
Proceeds from exercise of stock options	56	146	3
Net proceeds from other long-term obligations	179	606
Net cash flows from financing activities	(2,965)	(2,436)	(2,712)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND TEMPORARY INVESTMENTS	(589)	2,653	(525)
NET CHANGE IN CASH AND TEMPORARY INVESTMENTS	5,142	(9,220)	(7,334)
CASH AND TEMPORARY INVESTMENTS, beginning of year	21,895	31,115	38,449
CASH AND TEMPORARY INVESTMENTS, end of year	27,037	21,895	31,115
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash payments for interest	2,437	2,219	1,877
Cash payments for income taxes, net of refunds	$ 7,457	$ 7,815	$ 11,605