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Note 1 - Summary of Significant Accounting Policies (Details) (USD $) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  |
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Restatement Adjustment [Member] Reclassifications, Increase In Revenue [Member] | Dec. 31, 2012 Restatement Adjustment [Member] Reclassifications, Decrease In Revenue [Member] | Dec. 31, 2013 Primary Excess Layer of Casualty [Member] | Dec. 31, 2013 Single Loss [Member] | Dec. 31, 2012 Single Loss [Member] | Dec. 31, 2013 Each Policy Year [Member] | Dec. 31, 2012 Each Policy Year [Member] | Dec. 31, 2013 | Dec. 31, 2012 Aggregate For 3-Year ended Mar 31, 2013 [Member] | Dec. 31, 2013 Transport Enterprise Leasing, LLC [Member] | May 31, 2011 Transport Enterprise Leasing, LLC [Member] | Dec. 31, 2013 Tractors [Member] | Dec. 31, 2013 Refrigerated Trailers [Member] | Dec. 31, 2013 Dry Van Trailers [Member] | Dec. 31, 2013 Revenue Equipment [Member] Maximum [Member] | Dec. 31, 2013 Revenue Equipment [Member] Minimum [Member] | Dec. 31, 2012 Insurance and Claims [Member] | Dec. 31, 2011 Insurance and Claims [Member] | Dec. 31, 2013 Non-Asset Operations [Member] Solutions [Member] | Dec. 31, 2012 Non-Asset Operations [Member] Solutions [Member] | Dec. 31, 2013 Factoring Receivables [Member] | Dec. 31, 2013 Receivables from Insurers [Member] | Dec. 31, 2012 Receivables from Insurers [Member] | Dec. 31, 2013 Customer Concentration Risk [Member] Sales [Member] | Dec. 31, 2012 Customer Concentration Risk [Member] Sales [Member] | Dec. 31, 2011 Customer Concentration Risk [Member] Sales [Member] | Dec. 31, 2013 Customer Concentration Risk [Member] Maximum [Member] Sales [Member] | Dec. 31, 2012 Customer Concentration Risk [Member] Maximum [Member] Sales [Member] | Dec. 31, 2011 Customer Concentration Risk [Member] Maximum [Member] Sales [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Self-Insurance [Member] | Dec. 31, 2012 Self-Insurance [Member]
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Asset-Based Operating Fleets Aggregated in A Segment |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 176,487,000 | $ 170,843,000 | $ 172,488,000 | $ 164,731,000 | $ 177,495,000 | $ 168,427,000 | $ 171,301,000 | $ 157,031,000 | [1] |  | $ 684,549,000 | $ 674,254,000 | $ 652,627,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,700,000 | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34.00% | 32.00% | 39.00% |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |  |  |
Concentration Risk, Threshold Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00% |  |  |  |
Accounts Receivable, Net, Current | 81,242,000 |  |  |  | 76,220,000 |  |  |  |  |  | 81,242,000 | 76,220,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable | 1,736,000 |  |  |  | 1,729,000 |  |  |  |  |  | 1,736,000 | 1,729,000 | 1,711,000 | 1,537,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash Advance for Factoring Receivables, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% | 80.00% |  |
Restricted Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 7 years | 10 years | 10 years | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26.00% |  | 28.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Leases of Lessee, Term of Contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 84 months | 60 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  |  | 11,500,000 |  |  | 11,539,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years | 4 years |  |
Drivers Advances And Other Receivables Net Of Allowance | 5,356,000 |  |  |  | 3,851,000 |  |  |  |  |  | 5,356,000 | 3,851,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 500,000 |  |  |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 | 3,400,000
Liability for Claims and Claims Adjustment Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 9,000,000 | 9,000,000 | 18,000,000 | 18,000,000 | 30,000,000 | 27,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 | 10,000,000 |  |
Per Claim Excess Policy Coverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |  |  |
Auto Policy Release Premium Refund |  |  |  |  |  |  |  |  |  |  | 13,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-Cash Premium Credit Related To Commutation Of Policies |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Workers' Compensation, Self-Insurance Per Claim |  |  |  |  |  |  |  |  |  |  | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cargo Losses, Purchased Coverage Per Claim |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 300,000 |  |
Self-Insured Cargo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |
Employee Annual Insurance Deductible, Per Claim |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Costs Capitalized |  |  |  |  |  |  |  |  |  |  | 100,000 | 100,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) |  |  |  |  |  |  |  |  |  |  | 3,000 | 48,247 | 61,097 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement Revenue |  |  |  |  |  |  |  |  |  |  | 145,616,000 | 146,819,000 | 140,601,000 |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cargo and Freight Revenue |  |  |  |  |  |  |  |  |  |  | 538,933,000 | 527,435,000 | 512,026,000 |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Includes $2.4 million gain on the sale of a terminal property.

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