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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | UNITED STATES |  |  |
Concentration Risk, Percentage | 99.00% | 99.00% | 99.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk, Percentage | 13.00% | 9.00% | 8.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Walmart [Member] |  |  |
Concentration Risk, Percentage | 12.00% |  |
Tractor [Member] |  |  |
Replacement Of Equipment Period After Purchase | 4 years 36 days |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Property, Plant and Equipment, Salvage Value, Percentage | 25.00% |  |
Trailer [Member] |  |  |
Replacement Of Equipment Period After Purchase | 5 years 36 days |  |
Property, Plant and Equipment, Useful Life | 7 years |  |
Property, Plant and Equipment, Salvage Value, Percentage | 35.00% |  |
Tires In Service [Member] |  |  |
Property, Plant and Equipment, Useful Life | 2 years |  |
Supplies and Maintenance Costs [Member] |  |  |
Amortization | $ 6,300,000 | $ 5,700,000 | $ 5,800,000
Uninsured Risk [Member] | Auto Liability Claim [Member] |  |  |
Loss Contingency Range Possible Loss Per Claim | 1,000,000 |  |
Uninsured Risk [Member] | Workers Compensation Liability Claim [Member] |  |  |
Loss Contingency Range Possible Loss Per Claim | 750,000 |  |
Insurance Claims [Member] |  |  |
Letters of Credit Outstanding, Amount | $ 10,400,000 |  |
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions | 45.00% |  |
Letters of Credit Outstanding, Amount | $ 10,400,000 |  |
Number of Operating Segments | 6 |  |
Number of Reportable Segments | 4 | 4 | 2

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