SUBSEQUENT EVENTS	6 Months Ended
SUBSEQUENT EVENTS	May 29, 2011
Notes to Financial Statements [Abstract]
Schedule of Subsequent Events [Table Text Block]	SUBSEQUENT EVENTS On July 1, 2011, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with National Oilwell Varco, Inc., a Delaware corporation (“Parent”), and NOV Sub A, Inc., a Delaware corporation and wholly-owned subsidiary of Parent (“Merger Sub”). The Merger Agreement provides that, upon the terms and subject to the conditions set forth in the Merger Agreement, Merger Sub will merge with and into the Company (the “Merger”), with the Company surviving the Merger as a wholly-owned subsidiary of Parent. At the effective time of the Merger, each outstanding share of Common Stock, par value $2.50 per share, of the Company (“Common Stock”) (other than shares (i) owned by Parent, Merger Sub, or any other direct or indirect wholly-owned subsidiary of Parent (ii) held in the treasury of the Company, (iii) owned by any direct or indirect wholly-owned subsidiary of the Company or (iv) owned by stockholders of the Company who have perfected and not withdrawn a demand for appraisal rights under Delaware law), will be automatically cancelled and converted into the right to receive $85.00 in cash (the “Merger Consideration”) and each option to purchase a share of Common Stock would be converted into the right to receive the Merger Consideration, net of the option exercise price, in each case less applicable withholding taxes and without interest. The transaction was approved by the Company’s Board of Directors and is subject to customary conditions, including approval of the Merger Agreement and the Merger by the Company’s stockholders, expiration or termination of applicable waiting periods under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, the absence of any material adverse effect on the Company’s business and other customary closing conditions. The Company intends to file a proxy statement and other relevant documents concerning the transaction with the SEC. Stockholders of the Company are urged to read the proxy statement and other relevant documents when they become available because they will contain important information about the transaction.

Tabular disclosure of significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, losses resulting from fire or flood, losses on receivables, significant realized and unrealized gains and losses that result from changes in quoted market prices of securities, declines in market prices of inventory, changes in authorized or issued debt (SEC), significant foreign exchange rate changes, substantial loans to insiders or affiliates, significant long-term investments, and substantial dividends not in the ordinary course of business.

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