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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
OPERATING ACTIVITIES:      
Net income $ 19,922 $ 15,976 $ 14,838
Adjustments to reconcile net income to net cash flows used in operating activities:      
Depreciation and amortization 4,828 4,317 4,015
Loss on the deconsolidation of subsidiary     83
(Gain) Loss on disposals of equipment 18 74 (39)
Deferred tax provision 3,219 573 147
Provision for doubtful accounts (462) 282 243
Excess tax benefit from stock-based compensation   (106) (27)
Issuance of non-employee director shares 96 96 96
Changes in operating assets and liabilities:      
Accounts receivable (17,253) 5,736 (36,342)
Inventories 1,018 (11,015) (3,284)
Prepaid expenses (3,361) (31) 151
Accounts payable 12,931 3,819 24,662
Accrued liabilities (30) 338 5,394
Net cash flows from operating activities 20,926 20,059 9,937
INVESTING ACTIVITIES:      
Purchases of property, plant, and equipment (25,026) (11,900) (5,345)
Proceeds from sale of equipment 3 1 20
Net cash flows from investing activities (25,023) (11,899) (5,325)
FINANCING ACTIVITIES:      
Net borrowings under credit facility 5,000    
Payments of cash dividends (7,715) (7,253) (6,778)
Proceeds from exercise of stock options 3 186 186
Excess tax benefit from stock-based compensation   106 27
Net cash flows from financing activities (2,712) (6,961) (6,565)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND TEMPORARY INVESTMENTS (525) (2,347) (1,314)
NET CHANGE IN CASH AND TEMPORARY INVESTMENTS (7,334) (1,148) (3,267)
CASH AND TEMPORARY INVESTMENTS, beginning of year 38,449 39,597 42,864
CASH AND TEMPORARY INVESTMENTS, end of year 31,115 38,449 39,597
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:      
Cash payments for interest 1,877 1,432 1,015
Cash payments for income taxes, net of refunds $ 11,605 $ 8,566 $ 6,454