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Note 7 - Debt (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Jan. 29, 2013
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2008
May 31, 2011
Transport Enterprise Leasing, LLC [Member]
Jan. 29, 2013
Transport Enterprise Leasing, LLC [Member]
Maximum [Member]
Eighth Amendment [Member]
Mar. 31, 2014
Federal Funds Rate [Member]
Base Rate Loans [Member]
Mar. 31, 2014
London Interbank Offered Rate (LIBOR) [Member]
Base Rate Loans [Member]
Jan. 29, 2013
Eighth Amendment [Member]
Mar. 31, 2014
Base Rate Loans [Member]
Mar. 31, 2014
LIBOR [Member]
Sep. 30, 2008
Letter of Credit [Member]
Sep. 30, 2008
Swing Line Sub Facility [Member]
Jan. 29, 2013
When Availability Is Less Than $50 Million [Member]
Jan. 29, 2013
When Availability Is At Least $50 Million [Member]
Jan. 29, 2013
Testing of Fixed Charge Coverage Ratio Covenant [Member]
Jan. 29, 2013
Cash Dominion Applies [Member]
Dec. 31, 2012
Cash Dominion Applies [Member]
Mar. 31, 2014
Maximum [Member]
Applicable Margin [Member]
Base Rate Loans [Member]
Mar. 31, 2014
Maximum [Member]
Applicable Margin [Member]
LIBOR [Member]
Mar. 31, 2014
Maximum [Member]
Mar. 31, 2014
Minimum [Member]
Applicable Margin [Member]
Base Rate Loans [Member]
Mar. 31, 2014
Minimum [Member]
Applicable Margin [Member]
LIBOR [Member]
Mar. 31, 2014
Minimum [Member]
Note 7 - Debt (Details) [Line Items]                                                
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)       $ 85.0         $ 95.0     $ 85.0 $ 10.0                      
Line Of Credit Facility, Maximum Increase In Borrowing Capacity (in Dollars)       50.0                                        
Percent of Aggregate Commitments Under Credit Facility       10.00%                                        
Line of Credit Facility, Availability Block Removed (in Dollars) 15.0                                              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage                           0.375% 0.50% 12.50%         2.25%     1.50%
Line Of Credit Facility, Revolver Commitment Amount (in Dollars)   25.0                           11.9 14.3 75.0            
Line Of Credit Facility, Availability As Percentage Of Revolver Commitment   35.00%                             15.00%              
Maximum Stock Repurchase Aggregate Amount Allowed Pursuant To Credit Facility Agreement (in Dollars) 5.0                                              
Equity Method Investment, Ownership Percentage         49.00% 51.00%                                    
Debt Instrument, Fee Amount (in Dollars)     0.3                                          
Debt Instrument, Basis Spread on Variable Rate             0.50% 1.00%                     1.25% 2.25%   0.50% 1.50%  
Percent Of Eligible Accounts Receivable   85.00%                                            
Percent of Appraised Net Orderly Liquidation Value of Eligible Revenue Equipment   85.00%                                            
Percent of Net Book Value of Eligible Revenue Equipment   95.00%                                            
Percent Of Appraised Fair Market Value Of Eligible Real Estate   65.00%                                            
Line of Credit Facility, Amount Outstanding (in Dollars)   19.3                                            
Letters of Credit Outstanding, Amount (in Dollars)   38.2 39.0                                          
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars)   29.9                                            
Line of Credit Facility, Interest Rate at Period End                   5.00% 2.30%                          
Debt, Secured with a Cross Default Feature (in Dollars)   $ 178.3