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Statements of Consolidated Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
OPERATING ACTIVITIES    
Net income $ 1,518 $ 2,658
Adjustments to reconcile net income to net cash provided by (used in) operations:    
Depreciation and amortization 2,972 2,710
Provision for accounts receivable allowances 287 (10)
Provision for inventory reserves 457 9
Deferred income taxes (289) (23)
Share-based compensation expense 561 363
Gain on sale of property and equipment (7) (48)
Other - net 193 57
Changes in operating assets and liabilities    
Accounts receivable (6,144) (2,368)
Inventories (1,517) 1,657
Trade accounts payable and accrued liabilities (210) (2,331)
Income taxes - net 1,997 (196)
Other - net (1,387) (1,284)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES (1,569) 1,194
INVESTING ACTIVITIES    
Capital expenditures (2,217) (5,508)
Proceeds from the sale of property and equipment 17 61
Restricted cash and maturity (purchase) of fixed-term deposits - net 2,551 3,216
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES 351 (2,231)
FINANCING ACTIVITIES    
(Decrease) increase in notes payable to banks (695) 351
Proceeds from the issuance of long-term debt 15,463 15,706
Payments of long-term debt (13,155) (11,674)
Dividends paid (1,037) (1,056)
Excess tax expenses from share-based awards 0 (8)
Purchase of common shares for treasury 0 (627)
Purchase of common shares for treasury from related parties (107) (33)
NET CASH PROVIDED BY FINANCING ACTIVITIES 469 2,659
Effects of exchange rate changes on cash and cash equivalents 1,046 (652)
Net increase in cash and cash equivalents 297 970
Cash and cash equivalents at beginning of year 30,737 30,393
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 31,034 $ 31,363