CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
OPERATING ACTIVITIES:
Net income	$ 27,419	$ 22,947
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	6,612	5,577
(Gain) Loss on disposal of property, plant and equipment	(8)	133
Provision for doubtful accounts	(33)	163
Issuance of non-employee director shares	150	150
Deferred tax provision	59	123
Changes in operating assets and liabilities:
Accounts receivable	(16,841)	(25,807)
Inventories	(5,063)	(13,846)
Prepaid expenses	(1,483)	656
Other assets	781	(25)
Accounts payable	17,186	21,792
Accrued liabilities	(755)	3,508
Net cash flows from operating activities	28,024	15,371
INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(15,434)	(12,651)
Proceeds from sale of property, plant and equipment	31	117
Net cash flows from investing activities	(15,403)	(12,534)
FINANCING ACTIVITIES:
Net payments under credit facility	(5,000)
Payments of cash dividends	(6,156)	(6,149)
Net proceeds (payments) on other long-term obligations	(275)	281
Finance lease obligation payments	(15)
Proceeds from exercise of stock options		56
Net cash flows from financing activities	(11,446)	(5,812)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND TEMPORARY INVESTMENTS	(753)	(255)
NET CHANGE IN CASH AND TEMPORARY INVESTMENTS	422	(3,230)
CASH AND TEMPORARY INVESTMENTS, beginning of period	27,037	21,895
CASH AND TEMPORARY INVESTMENTS, end of period	27,459	18,665
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash payments for interest	2,500	1,788
Cash payments for income taxes, net of refunds	$ 9,050	$ 6,136