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Note 9 - Commitments and Contingencies (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2016	Dec. 31, 2012 Revenue Equipment [Member]	Dec. 31, 2012 Building Construction And Acquisition [Member]
Purchase Commitment, Remaining Minimum Amount Committed		$ 19.4	$ 3.8
Operating Leases, Future Minimum Payments Due	$ 1.1

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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- Definition

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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