Accounts Receivable

9 Months Ended

Sep. 30, 2016

Receivables [Abstract]

Accounts Receivable

3. Accounts Receivable

(Table only in thousands)	September 30, 2016			December 31, 2015
Trade receivables	$	12,068		$	12,800
Contract receivables		72,641			86,129
Allowance for doubtful accounts		(1,350	)		(1,151	)
	$	83,359		$	97,778

Balances billed but not paid by customers under retainage provisions in contracts amounted to approximately $2.0 million and $2.3 million at September 30, 2016 and December 31, 2015, respectively. Retainage receivables on contracts in progress are generally collected within a year after contract completion.

The provision for doubtful accounts was $30,000 and $0.4 million for the three-month periods ended September 30, 2016 and 2015, respectively, and $0.3 million and $0.5 million for the nine-month periods ended September 30, 2016 and 2015, respectively.