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Note 7 - Debt (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Schedule of Debt [Table Text Block]
(in thousands)
 
December 31, 2012
   
December 31, 2011
 
   
Current
   
Long-Term
   
Current
   
Long-Term
 
Borrowings under Credit Facility
  $ -     $ 5     $ 15,890     $ -  
Revenue equipment installment notes; weighted average interest rate of 5.2% at December 31, 2012, and 5.7% December 31, 2011, due in monthly installments with final maturities at various dates ranging from January 2013 to January 2018, secured by related revenue equipment
    61,200       94,920       80,003       125,666  
Real estate note; interest rate of 2.7% and 2.8% at December 31, 2012 and 2011, respectively, due in monthly installments with fixed maturity at October 2013, secured  by related real-estate
    2,328       -       365       2,258  
Other note payable, interest rate of 3.0% at December 31, 2012 and 2011, with fixed maturity at November 2016
    108       289       -       243  
Total debt
    63,636       95,214       96,258       128,167  
Principal portion of capital lease obligations, secured by related revenue  equipment
    2,091       14,003       1,957       16,129  
                                 
Total debt and capital lease obligations
  $ 65,727     $ 109,217     $ 98,215     $ 144,296  
   
Schedule of Long-term Debt Instruments [Table Text Block]  
Level
Average Pricing
Availability
 
Base
Rate
Loans
     
LIBOR Loans
     
L/C
Fee
 
I      
>
$75,000,000   .50%       1.50%       1.50%  
II
≤ $75,000,000 but
>
$50,000,000   .75%       1.75%       1.75%  
III
≤ $50,000,000 but
>
$25,000,000   1.00%       2.00%       2.00%  
IV
≤
$25,000,000
        1.25%       2.25%       2.25%  
Level
Average Excess
Availability
 
Base Rate
Loans
     
LIBOR
Loans
         
I      
>
$70,000,000   1.25%       2.25%          
II ≤ $70,000,000 but
>
$35,000,000   1.50%       2.50%          
III ≤ $35,000,000 but
>
$20,000,000   1.75%       2.75%          
IV ≤ $20,000,000 but
>
$10,000,000   2.00%       3.00%          
V ≤
$10,000,000
        2.25%       3.25%          
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]    
   
(in thousands)
 
2013
  $ 63,636  
2014
  $ 25,520  
2015
  $ 33,132  
2016
  $ 27,657  
2017
  $ 6,793  
Thereafter
  $ 2,112