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Note 3 - Trade Accounts Receivable
12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Financing Receivables [Text Block]
3.
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, 2019
and
2018:
 
   
20
1
9
   
20
1
8
 
   
(
i
n thousands)
 
                 
Billed
  $
57,495
    $
56,766
 
Unbilled
   
7,241
     
8,808
 
Allowance for doubtful accounts
   
(2,952
)    
(2,224
)
                 
Total accounts receivable—net
  $
61,784
    $
63,350
 
 
An analysis of changes in the allowance for doubtful accounts for the years ended
December 31, 2019,
2018,
and
2017
follows:
 
   
20
1
9
   
20
1
8
   
20
1
7
 
   
(
i
n thousands)
 
                         
Balance—beginning of year
  $
2,224
    $
1,335
    $
994
 
Provision for bad debts
   
728
     
889
     
341
 
Charge-offs
   
-
     
-
     
-
 
Recoveries
   
-
     
-
     
-
 
Balance—end of year
  $
2,952
    $
2,224
    $
1,335