Accounts Receivable

12 Months Ended

Dec. 31, 2015

Receivables [Abstract]

Accounts Receivable

3. Accounts Receivable

(Table only in thousands)	2015			2014
Trade receivables	$	12,800		$	15,875
Contract receivables		86,129			43,218
Allowance for doubtful accounts		(1,151	)		(699	)
	$	97,778		$	58,394

Balances billed, but not paid by customers under retainage provisions in contracts, amounted to approximately $2.3 million and $0.5 million at December 31, 2015 and 2014, respectively. Retainage receivables on contracts in progress are generally collected within a year after contract completion.

Provision for doubtful accounts was approximately $0.7 million, $0.3 million and $0.1 million during 2015, 2014 and 2013, respectively, while accounts charged to (recovered from) the allowance were $0.2 million, $0.3 million and $(35,000) during 2015, 2014 and 2013, respectively.