Note 10 - Leases and Commitments (Detail) (USD $) In Millions, unless otherwise specified	Jan. 31, 2013	Dec. 31, 2012
Capital Leases, Future Minimum Payments Due		$ 53.2
Capital Lease Obligations, Current		16.4
Revenue Equipment [Member]
Purchase Commitment, Remaining Minimum Amount Committed		23.20
Non-Revenue Equipment [Member]
Purchase Commitment, Remaining Minimum Amount Committed		0.02
Capital Lease Obligations [Member]
Interest Payable		4.3
Maximum Authorized Amount of New Capital Leases	45.0	50.0
Lease Borrowing Availability		$ 22.2

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid within one year (or one operating cycle, if longer) of the balance sheet date.

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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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