Note 2 - Trade Accounts Receivable

12 Months Ended

Dec. 31, 2015

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, 2015 and 2014:

	2015			2014
	(in thousands)

Billed	$	43,502		$	49,302
Unbilled		6,359			5,292
Allowance for doubtful accounts		(549	)		(1,611	)

Total accounts receivable—net	$	49,312		$	52,983

An analysis of changes in the allowance for doubtful accounts for the years ended December 31, 2015, 2014, and 2013 follows:

	2015			2014			2013
	(in thousands)

Balance—beginning of year	$	1,611		$	1,477		$	1,157
Provision for bad debts		151			456			424
Charge-offs		(1,231	)		(322	)		(104	)
Recoveries		18			-			-
Balance—end of year	$	549		$	1,611		$	1,477