Note 9 - Leases and Commitments (Details) (USD $)	Dec. 31, 2013	Feb. 28, 2014 Subsequent Event [Member] Capital Lease Obligations [Member]	Dec. 31, 2013 Revenue Equipment [Member]	Dec. 31, 2013 Capital Lease Obligations [Member]
Note 9 - Leases and Commitments (Details) [Line Items]
Capital Leases, Future Minimum Payments Due	$ 63,600,000
Interest Payable				2,900,000
Capital Lease Obligations, Current	20,100,000
Maximum Authorized Amount of New Capital Leases		20,000,000		45,000,000
Lease Borrowing Availability				27,600,000
Purchase Obligation			$ 8,600,000