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Note 7 - Debt (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Jul. 01, 2015
Aug. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Line of Credit Facility, Maximum Borrowing Capacity     $ 95,000,000  
Line of Credit Facility, Maximum Increase in Borrowing Capacity     $ 50,000,000  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.25% 0.25%  
Debt Instrument, Fee Amount   $ 200,000    
Debt Instrument Covenant, Maximum Share Repurchases     45  
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%  
Line of Credit Facility, Availability as Percentage of Revolver Commitment     35.00%  
Line of Credit Facility, Revolver Commitment, Amount     $ 25,000,000  
Percent of Appraised Fair Market Value of Eligible Real Estate     65.00%  
Long-term Line of Credit     $ 12,200,000  
Letters of Credit Outstanding, Amount     27,200,000 $ 31,400,000
Line of Credit Facility, Remaining Borrowing Capacity     55,600,000  
Debt, Secured with a Cross Default Feature     166,100,000  
Commodity Contract Asset, Current     3,600,000  
Fixed Charge Coverage Requirement     $ 0 $ 0
Interest Rate Swap [Member]        
Derivative, Fixed Interest Rate   4.20%    
Variable Rate Note [Member]        
Debt Instrument, Fee Amount   $ 28,000,000    
Variable Rate Note [Member] | Interest Rate Swap [Member]        
Derivative, Fixed Interest Rate   4.20%    
Federal Funds Rate [Member] | Base Rate Loans [Member]        
Debt Instrument, Basis Spread on Variable Rate     0.50%  
London Interbank Offered Rate (LIBOR) [Member]        
Long-term Line of Credit     $ 3,200,000  
Debt Instrument, Interest Rate, Stated Percentage     4.30%  
London Interbank Offered Rate (LIBOR) [Member] | Base Rate Loans [Member]        
Debt Instrument, Basis Spread on Variable Rate     1.00%  
Applicable Margin [Member] | Base Rate Loans [Member] | Minimum [Member]        
Debt Instrument, Basis Spread on Variable Rate     0.50%  
Applicable Margin [Member] | Base Rate Loans [Member] | Maximum [Member]        
Debt Instrument, Basis Spread on Variable Rate     1.00%  
Applicable Margin [Member] | LIBOR [Member] | Minimum [Member]        
Debt Instrument, Basis Spread on Variable Rate     1.50%  
Applicable Margin [Member] | LIBOR [Member] | Maximum [Member]        
Debt Instrument, Basis Spread on Variable Rate     2.00%  
Base Rate Loans [Member]        
Long-term Line of Credit     $ 9,000,000  
Debt Instrument, Interest Rate, Stated Percentage     2.30%  
Letter of Credit [Member]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 95,000,000  
Swing Line Sub Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 10,000,000  
Percent of Aggregate Commitments under Credit Facility     10.00%  
When Availability is less than 50 Million [Member]        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.375%      
When Availability is at least 50 Million [Member]        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.50%