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Statements of Consolidated Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
OPERATING ACTIVITIES      
Net income $ 15,255 $ 6,675 $ 12,861
Adjustments to reconcile net income to net cash provided by operations:      
Depreciation and amortization 11,996 11,532 12,857
Provision for accounts receivable allowances 2,184 961 1,211
Provision for inventory reserves 2,736 2,477 2,244
Deferred income taxes 2,249 (944) (1,697)
Share-based compensation expense 1,366 248 1,542
Excess tax benefits from share-based awards 2 20 (97)
Loss (gain) on sale of property and equipment (20) 363 115
Other - net 537 67 26
Changes in operating assets and liabilities (excluding impact of acquired assets):      
Accounts receivable (2,292) (2,965) (2,435)
Inventories (6,354) (2,297) (5,704)
Trade accounts payables and accrued liabilities 3,279 5,652 6,716
Income taxes, net (4,999) (4,038) (882)
Other - net 35 2,478 (1,501)
NET CASH PROVIDED BY OPERATING ACTIVITIES 25,974 20,229 25,256
INVESTING ACTIVITIES      
Capital expenditures (24,725) (10,754) (17,663)
Business acquisitions, net of cash acquired 0 0 (14,975)
Proceeds from the sale of property and equipment 70 929 142
Restricted cash and purchase of fixed-term deposits (3,814) (1,037) (797)
NET CASH USED IN INVESTING ACTIVITIES (28,469) (10,862) (33,293)
FINANCING ACTIVITIES      
Increase (decrease) in notes payable to banks 851 (775) 941
Proceeds from the issuance of long-term debt 70,274 51,942 75,774
Payments of long-term debt (57,742) (51,940) (57,123)
Dividends paid (4,170) (4,391) (4,412)
Excess tax benefits from share-based awards (2) (20) 97
Proceeds from issuance of common shares 248 80 166
Purchase of common shares for treasury (3,108) (6,003) (104)
Purchase of common shares for treasury from related parties (1,962) (1,550) (2,130)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES 4,389 (12,657) 13,209
Effects of exchange rate changes on cash and cash equivalents (1,550) 4,040 180
Net increase in cash and cash equivalents 344 750 5,352
Cash and cash equivalents at beginning of year 30,393 29,643 24,291
CASH AND CASH EQUIVALENTS AT END OF YEAR $ 30,737 $ 30,393 $ 29,643