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Note 7 - Debt (Details) (USD $)
 1 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jan. 29, 2013
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2008
Jan. 29, 2013
Transport Enterprise Leasing, LLC [Member]
Eighth Amendment [Member]
Maximum [Member]
May 31, 2011
Transport Enterprise Leasing, LLC [Member]
Jan. 29, 2013
Eighth Amendment [Member]
Jun. 30, 2014
Base Rate Loans [Member]
Federal Funds Rate [Member]
Jun. 30, 2014
Base Rate Loans [Member]
London Interbank Offered Rate (LIBOR) [Member]
Jun. 30, 2014
Base Rate Loans [Member]
Applicable Margin [Member]
Maximum [Member]
Jun. 30, 2014
Base Rate Loans [Member]
Applicable Margin [Member]
Minimum [Member]
Jun. 30, 2014
Base Rate Loans [Member]
Jun. 30, 2014
LIBOR [Member]
Applicable Margin [Member]
Maximum [Member]
Jun. 30, 2014
LIBOR [Member]
Applicable Margin [Member]
Minimum [Member]
Jun. 30, 2014
LIBOR Loans [Member]
Jun. 30, 2014
Letter of Credit [Member]
Jun. 30, 2014
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]
Jun. 30, 2014
Maximum [Member]
Jun. 30, 2014
Minimum [Member]
Note 7 - Debt (Details) [Line Items]                                                
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)       $ 85,000,000     $ 95,000,000                 $ 85,000,000 $ 10,000,000              
Line Of Credit Facility, Maximum Increase In Borrowing Capacity (in Dollars)   50,000,000                                            
Percent of Aggregate Commitments Under Credit Facility   10.00%                                            
Line of Credit Facility, Availability Block Removed (in Dollars) 15,000,000                                              
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)   25,000,000                                   11,900,000 14,300,000 75,000,000    
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) 5,000,000                                              
Equity Method Investment, Ownership Percentage         51.00% 49.00%                                    
Debt Instrument, Fee Amount (in Dollars)     300,000                                          
Debt Instrument, Basis Spread on Variable Rate               0.50% 1.00% 1.25% 0.50%   2.25% 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%                                            
Long-term Line of Credit (in Dollars)   16,800,000                   3.8     13.0                  
Letters of Credit Outstanding, Amount (in Dollars)   37,200,000 39,000,000                                          
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars)   35,700,000                                            
Line of Credit Facility, Interest Rate at Period End                       5.00%     2.30%                  
Debt, Secured with a Cross Default Feature (in Dollars)   $ 176,800,000