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Note 1 - Significant Accounting Policies (Detail) (USD $)
 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 36 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2013
Dec. 31, 2009
Dec. 31, 2012
Transport Enterprise Leasing, LLC [Member]
May 31, 2011
Transport Enterprise Leasing, LLC [Member]
Dec. 31, 2012
Solutions [Member]
Non-Asset Operations [Member]
Dec. 31, 2012
Star Transportation, Inc. [Member]
Dec. 31, 2012
Self-Insurance [Member]
Dec. 31, 2011
Self-Insurance [Member]
Dec. 31, 2012
Tractors [Member]
Dec. 31, 2012
Refrigerated Trailers [Member]
Dec. 31, 2012
Dry Van Trailers [Member]
Dec. 31, 2012
Cargo Losses [Member]
Maximum [Member]
Dec. 31, 2012
Cargo Losses [Member]
Minimum [Member]
Dec. 31, 2012
Factoring Receivables [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Primary Excess Layer of Casualty [Member]
Dec. 31, 2012
Single Loss [Member]
Dec. 31, 2012
Each Policy Year [Member]
Number of Reportable Segments                 2                                            
Equity Method Investment, Ownership Percentage                           49.00% 49.00%                                
Revenues $ 177,495,000 $ 168,427,000 $ 171,301,000 $ 157,031,000 $ 161,953,000 $ 161,418,000 $ 172,865,000 $ 156,391,000 $ 674,254,000 $ 652,627,000 $ 649,749,000         $ 800,000                              
Entity-Wide Revenue, Major Customer, Percentage                 32.00% 39.00% 40.00%                               10.00%        
Accounts Receivable, Net, Current 76,220,000       64,676,000       76,220,000 64,676,000                             7,500,000            
Allowance for Doubtful Accounts Receivable 1,729,000       1,711,000       1,729,000 1,711,000 1,537,000   1,845,000                       100,000            
Cash Advance for Factoring Receivables, Percentage                                                   90.00% 90.00% 80.00%      
Restricted Cash and Cash Equivalents                                                 300,000            
Property, Plant and Equipment, Useful Life                                       5 years 7 years 10 years                  
Property, Plant and Equipment, Salvage Value, Percentage                                       23.00%   21.00%                  
Finite-Lived Intangible Asset, Useful Life                                                   20 years   4 years      
Liability for Claims and Claims Adjustment Expense 4,000,000               4,000,000     27,000,000                           20,000,000 20,000,000 10,000,000 1,000,000 9,000,000 15,000,000
Ceded Credit Risk, Claims, Loss Adjustment Expense Incurred                 500,000 2,000,000                                          
Other Assets                                   3,400,000 2,200,000                        
Per Claim Excess Policy Coverage                                                   30,000,000          
Workers' Compensation, Self-Insurance Per Claim                 1,300,000                                            
Prepaid Insurance                                             2,000,000 300,000              
Self-Insured Cargo                                                       2,000,000      
Employee Annual Insurance Deductible, Per Claim                 400,000               200,000                            
Employee Lifetime Insurance Benefit                 1,000,000               1,000,000                            
Interest Costs Capitalized                 $ 100,000 $ 100,000 $ 100,000                                        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares)                 48,247 61,097 70,178