CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
OPERATING ACTIVITIES:
Net income	$ 22,947	$ 13,720
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	5,577	4,169
(Gain) loss on disposal of property, plant and equipment	133	(624)
Provision for doubtful accounts	163	(32)
Issuance of non-employee director shares	150	150
Deferred tax provision	123	14
Changes in operating assets and liabilities:
Accounts receivable	(25,807)	(9,318)
Inventories	(13,846)	960
Prepaid expenses	656	1,815
Other assets	(25)	28
Accounts payable	21,792	(6,661)
Accrued liabilities	3,508	4,425
Net cash flows from operating activities	15,371	8,646
INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(12,651)	(19,246)
Proceeds from sale of property, plant and equipment	117	1,303
Net cash flows from investing activities	(12,534)	(17,943)
FINANCING ACTIVITIES:
Net borrowings under credit facility		15,000
Payments of cash dividends	(6,149)	(6,139)
Net proceeds from other long-term obligations	281	143
Proceeds from exercise of stock options	56
Net cash flows from financing activities	(5,812)	9,004
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND TEMPORARY INVESTMENTS	(255)	2,677
NET CHANGE IN CASH AND TEMPORARY INVESTMENTS	(3,230)	2,384
CASH AND TEMPORARY INVESTMENTS, beginning of period	21,895	31,115
CASH AND TEMPORARY INVESTMENTS, end of period	18,665	33,499
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash payments for interest	1,788	1,620
Cash payments for income taxes, net of refunds	$ 6,136	$ 2,672