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Note 7 - Debt (Details) (USD $)
 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Jan. 29, 2013
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2008
Dec. 31, 2013
Transport Enterprise Leasing, LLC [Member]
May 31, 2011
Transport Enterprise Leasing, LLC [Member]
Jan. 29, 2013
Transport Enterprise Leasing, LLC [Member]
Maximum [Member]
Eighth Amendment [Member]
Dec. 31, 2013
Federal Funds Rate [Member]
Base Rate Loans [Member]
Dec. 31, 2013
London Interbank Offered Rate (LIBOR) [Member]
Base Rate Loans [Member]
Jan. 29, 2013
Eighth Amendment [Member]
Dec. 31, 2013
Base Rate Loans [Member]
Dec. 31, 2013
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]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
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         49.00% 49.00% 51.00%                            
Debt Instrument, Fee Amount (in Dollars)   300,000                                      
Debt Instrument, Basis Spread on Variable Rate               0.50% 1.00%                        
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)   7,000,000                                      
Letters of Credit Outstanding, Amount (in Dollars)   39,000,000 39,600,000                                    
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars)   44,100,000                                      
Line of Credit Facility, Interest Rate at Period End                     5.00% 2.30%                  
Debt, Secured with a Cross Default Feature (in Dollars)   $ 192,500,000