Note 3 - Trade Accounts Receivable

12 Months Ended

Dec. 31, 2018

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, 2018

and

2017:

	20 1 8			20 1 7
	( i n thousands)

Billed	$	56,766		$	51,236
Unbilled		8,808			9,154
Allowance for doubtful accounts		(2,224	)		(1,335	)

Total accounts receivable—net	$	63,350		$	59,055

An analysis of changes in the allowance for doubtful accounts for the years ended

December 31, 2018,

2017,

and

2016

follows:

	20 1 8		20 1 7		20 1 6
	( i n thousands)

Balance—beginning of year	$	1,335	$	994	$	549
Provision for bad debts		889		341		445
Charge-offs		-		-		-
Recoveries		-		-		-

Balance—end of year	$	2,224	$	1,335	$	994