CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES:
Net income	$ 15,976	$ 14,838	$ 8,688
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	4,317	4,015	3,763
Loss on the deconsolidation of subsidiary		83
(Gain) Loss on disposals of equipment	74	(39)	(2)
Deferred tax provision	573	147	(225)
Provision for doubtful accounts	282	243	211
Excess tax benefit from stock-based compensation	(106)	(27)	(225)
Issuance of non-employee director shares	96	96	75
Changes in operating assets and liabilities:
Accounts receivable	5,736	(36,366)	(21,993)
Inventories	(11,015)	(3,284)	(8,506)
Prepaid expenses	(31)	151	(173)
Accounts payable	3,819	24,662	16,164
Accrued liabilities	338	5,394	3,415
Net cash flows from operating activities	20,059	9,913	1,192
INVESTING ACTIVITIES:
Purchases of property, plant, and equipment	(11,900)	(5,345)	(2,430)
Proceeds from sale of equipment	1	20	19
Payments received on notes receivables		24	76
Net cash flows from investing activities	(11,899)	(5,301)	(2,335)
FINANCING ACTIVITIES:
Payments of cash dividends	(7,253)	(6,778)	(6,294)
Proceeds from exercise of stock options	186	186	621
Excess tax benefit from stock-based compensation	106	27	225
Net cash flows from financing activities	(6,961)	(6,565)	(5,448)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND TEMPORARY INVESTMENTS	(2,347)	(1,314)	864
NET CHANGE IN CASH AND TEMPORARY INVESTMENTS	(1,148)	(3,267)	(5,727)
CASH AND TEMPORARY INVESTMENTS, beginning of year	39,597	42,864	48,591
CASH AND TEMPORARY INVESTMENTS, end of year	38,449	39,597	42,864
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash payments for interest	1,432	1,015	912
Cash payments for income taxes, net of refunds	$ 8,566	$ 6,454	$ 2,419