CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
OPERATING ACTIVITIES:
Net income	$ 14,270	$ 9,264
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	3,518	2,686
(Gain) loss on disposals of property, plant and equipment	133	(643)
Provision for doubtful accounts	115	(50)
Issuance of non-employee director shares	150	150
Deferred tax provision	182	63
Changes in operating assets and liabilities:
Accounts receivable	(15,585)	(8,455)
Inventories	(13,024)	(3,448)
Prepaid expenses	(287)	820
Other assets	(21)	45
Accounts payable	12,823	(2,971)
Accrued liabilities	3,817	3,931
Net cash flows from operating activities	6,091	1,392
INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(9,392)	(14,304)
Proceeds from sale of property, plant and equipment	132	1,305
Net cash flows from investing activities	(9,260)	(12,999)
FINANCING ACTIVITIES:
Net borrowings under credit facility	5,000	15,000
Payments of cash dividends	(4,098)	(4,091)
Net proceeds from other long-term obligations	374	142
Net cash flows from financing activities	1,276	11,051
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND TEMPORARY INVESTMENTS	(289)	1,471
NET CHANGE IN CASH AND TEMPORARY INVESTMENTS	(2,182)	915
CASH AND TEMPORARY INVESTMENTS, beginning of period	21,895	31,115
CASH AND TEMPORARY INVESTMENTS, end of period	19,713	32,030
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash payments for interest	1,121	1,044
Cash payments for income taxes, net of refunds	$ 3,699	$ 761