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Note 10 - Commitments and Contingent Liabilities (Detail) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Maximum [Member]
Letters of Credit Outstanding, Amount	$ 40.2	$ 39.6
undefined			4.0
Purchase Commitment, Remaining Minimum Amount Committed	$ 83.6

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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