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Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Current Assets    
Cash and cash equivalents $ 75,835 $ 81,056 [1]
Short-term investments 19,994  
Trade receivables, net 49,026 42,225 [1]
Gross inventories 46,264 49,004 [1]
Less LIFO reserve (37,405) (37,476) [1]
Less excess and obsolescence reserve (1,238) (1,311) [1]
Net inventories 7,621 10,217 [1]
Deferred income taxes 6,861 5,776 [1]
Prepaid expenses and other current assets 1,025 6,968 [1]
Total Current Assets 160,362 146,242 [1]
Property, plant and equipment 171,869 169,142 [1]
Less allowances for depreciation (119,252) (116,195) [1]
Net property, plant and equipment 52,617 52,947 [1]
Deferred income taxes 312 32 [1]
Other assets 8,102 7,289 [1]
Total Assets 221,393 206,510 [1]
Current Liabilities    
Trade accounts payable and accrued expenses 31,075 28,592 [1]
Product liability 1,283 1,305 [1]
Employee compensation and benefits 10,644 14,882 [1]
Workers' compensation 4,728 4,600 [1]
Income taxes payable 4,405 217 [1]
Total Current Liabilities 52,135 49,596 [1]
Accrued pension liability 19,082 19,082 [1]
Product liability accrual 398 441 [1]
Contingent liabilities - Note 11       [1]
Stockholders' Equity    
Additional paid-in capital 11,358 10,454 [1]
Retained earnings 180,402 168,981 [1]
Less: Treasury stock - at cost 2012 - 4,299,434 shares 2011 - 4,299,434 shares (37,884) (37,884) [1]
Accumulated other comprehensive loss (27,543) (27,543) [1]
Total Stockholders' Equity 149,778 137,391 [1]
Total Liabilities and Stockholders' Equity 221,393 206,510 [1]
Nonvoting Common Stock
    
Stockholders' Equity    
Common Stock, Value       [1]
Voting Common Stock
    
Stockholders' Equity    
Common Stock, Value $ 23,445 $ 23,383 [1]
[1] Note: The balance sheet at December 31, 2011 has been derived from the audited financial statements at that date but does not include all the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements.