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Note 2 - Trade Accounts Receivable
 12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Financing Receivables [Text Block]
2.
TRADE ACCOUNTS RECEIVABLE
 
The Company's receivables result primarily from the sale of transportation and logistics services. The Company performs ongoing credit evaluations of its customers and generally does not require collateral for accounts receivable. Accounts receivable, which consist of both billed and unbilled receivables, are presented net of an allowance for doubtful accounts. Accounts outstanding longer than contractual payment terms are considered past due and are reviewed individually for collectability. Accounts receivable balances consist of the following components as of
December
31,
2016
and
2015:
 
 
 
2016
 
 
2015
 
 
 
(in thousands)
 
                 
Billed
   $
48,538
     $
43,502
  
Unbilled
    
8,599
     
6,359
 
Allowance for doubtful accounts
    
(994
 )    
(549
 )
                 
Total accounts receivable—net
   $
56,143
    $
49,312
 
 
An analysis of changes in the allowance for doubtful accounts for the years ended
December
31,
2016,
2015,
and
2014
follows:
 
 
 
2016
 
 
2015
 
 
2014
 
 
 
(in thousands)
 
                         
Balance—beginning of year
   $
549
    $
1,611
    $
1,477
 
Provision for bad debts
    
445
      
151
      
456
  
Charge-offs
    
-
      
(1,231
 )    
(322
 )
Recoveries
    
-
      
18
      
-
  
                         
Balance—end of year
   $
994
     $
549
     $
1,611