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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING ACTIVITIES:      
Net income $ 23,016 $ 19,922 $ 15,976
Adjustments to reconcile net income to net cash flows used in operating activities:      
Depreciation and amortization 6,147 4,828 4,317
(Gain) Loss on disposals of property and equipment (608) 18 74
Deferred tax provision (868) 3,219 573
Provision for doubtful accounts 86 (462) 282
Issuance of non-employee director shares 150 96 96
Changes in operating assets and liabilities:      
Accounts receivable (6,668) (17,253) 5,736
Inventories (2,844) 1,018 (11,015)
Prepaid expenses 765 (3,361) (31)
Accounts payable (5,806) 12,931 3,819
Accrued liabilities 583 (30) 338
Net cash flows from operating activities 13,953 20,926 20,165
INVESTING ACTIVITIES:      
Purchases of property, plant, and equipment (24,693) (25,026) (11,900)
Proceeds from sale of property and equipment 1,303 3 1
Net cash flows from investing activities (23,390) (25,023) (11,899)
FINANCING ACTIVITIES:      
Net borrowings under credit facility 5,000 5,000  
Payments of cash dividends (8,188) (7,715) (7,253)
Proceeds from exercise of stock options 146 3 186
Proceeds from other long-term obligations 606    
Net cash flows from financing activities (2,436) (2,712) (7,067)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND TEMPORARY INVESTMENTS 2,653 (525) (2,347)
NET CHANGE IN CASH AND TEMPORARY INVESTMENTS (9,220) (7,334) (1,148)
CASH AND TEMPORARY INVESTMENTS, beginning of year 31,115 38,449 39,597
CASH AND TEMPORARY INVESTMENTS, end of year 21,895 31,115 38,449
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:      
Cash payments for interest 2,219 1,877 1,432
Cash payments for income taxes, net of refunds $ 7,815 $ 11,605 $ 8,566