CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
OPERATING ACTIVITIES:
Net income	$ 16,255	$ 29,830	$ 39,111
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	11,036	9,598	9,127
(Gain) Loss on disposal of property, plant and equipment	(38)	17	(21)
Provision for credit losses	(137)	195	15
Issuance of non-employee director shares	200	194	150
Deferred tax provision	1,012	752	1,708
Changes in operating assets and liabilities:
Accounts receivable	(12,723)	27,375	(19,605)
Inventories	(32,071)	5,466	5,453
Prepaid expenses	(2,603)	1,652	(1,529)
Other assets	116	321	609
Accounts payable	33,939	(10,881)	(2,165)
Accrued liabilities	282	(3,810)	2,279
Net cash flows from operating activities	15,268	60,709	35,132
INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(9,150)	(17,500)	(17,391)
Proceeds from sale of property, plant and equipment	91	276	328
Net cash flows from investing activities	(9,059)	(17,224)	(17,063)
FINANCING ACTIVITIES:
Net payments under credit facility		(4,998)	(10,002)
Payments of cash dividends	(8,216)	(8,212)	(8,208)
Net payments on other long-term obligations		(400)	(367)
Finance lease obligation payments	(22)	(21)	(20)
Net cash flows from financing activities	(8,238)	(13,631)	(18,597)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND TEMPORARY INVESTMENTS	(1,160)	1,595	(437)
NET CHANGE IN CASH AND TEMPORARY INVESTMENTS	(3,189)	31,449	(965)
CASH AND TEMPORARY INVESTMENTS, beginning of period	57,521	26,072	27,037
CASH AND TEMPORARY INVESTMENTS, end of period	54,332	57,521	26,072
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash payments for interest	1,570	2,052	3,249
Cash payments for income taxes, net of refunds	$ 5,890	$ 6,721	$ 10,067