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Statements of Consolidated Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
OPERATING ACTIVITIES      
Net income $ 30,984 $ 23,008 $ 22,833
Adjustments to reconcile net income to net cash provided by operations:      
Depreciation and amortization 10,525 9,394 7,249
Provision for accounts receivable allowances 1,292 661 546
Provision for inventory reserves 1,480 767 2,395
Deferred income taxes (688) (900) 682
Share-based compensation expense 2,933 2,966 1,962
Excess tax benefits from share-based awards (203) (73) (122)
Net investment in life insurance (28) (74) (489)
Gain on acquisition of business     (9,087)
Other--net 73 (301) (232)
Changes in operating assets and liabilities:      
Accounts receivable (16,061) (4,977) (594)
Inventories (21,197) (8,268) 922
Trade accounts payables and accrued liabilities 8,574 8,429 3,750
Income taxes payable (815) 383 781
Other--net 180 (2,327) (1,581)
NET CASH PROVIDED BY OPERATING ACTIVITIES 17,049 28,688 29,015
INVESTING ACTIVITIES      
Capital expenditures (18,912) (12,274) (10,667)
Business acquisitions, net of cash acquired   (14,324) (13,199)
Proceeds from the sale of discontinued operations     750
Proceeds from the sale of property and equipment 464 757 422
Restricted cash (328)    
Proceeds on life insurance     3,082
Payments on life insurance     (3,082)
NET CASH USED IN INVESTING ACTIVITIES (18,776) (25,841) (22,694)
FINANCING ACTIVITIES      
Increase (decrease) in notes payable to banks 20,299 4,470  
Proceeds from the issuance of long-term debt   130 1,330
Payments of long-term debt (1,239) (2,465) (529)
Dividends paid (4,381) (4,344) (4,271)
Excess tax benefits from share-based awards 203 73 122
Proceeds from issuance of common shares 1,064 285 352
Purchase of common shares for treasury (3,522) (1,081) (168)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES 12,424 (2,932) (3,164)
Effects of exchange rate changes on cash and cash equivalents (1,226) (1,357) 1,071
Net increase (decrease) in cash and cash equivalents 9,471 (1,442) 4,228
Cash and cash equivalents at beginning of year 22,655 24,097 19,869
CASH AND CASH EQUIVALENTS AT END OF YEAR $ 32,126 $ 22,655 $ 24,097