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Accounts Receivable
 9 Months Ended
Sep. 30, 2017
Receivables [Abstract]  
Accounts Receivable

3.

Accounts Receivable

 

(Table only in thousands)

 

September 30,

2017

 

 

December 31,

2016

 

Trade receivables

 

$

13,211

 

 

$

11,976

 

Contract receivables

 

 

60,176

 

 

 

72,835

 

Allowance for doubtful accounts

 

 

(2,883

)

 

 

(1,749

)

 

 

$

70,504

 

 

$

83,062

 

 

Balances billed but not paid by customers under retainage provisions in contracts amounted to approximately $2.6 million and $3.2 million at September 30, 2017 and December 31, 2016, respectively. Retainage receivables on contracts in progress are generally collected within a year after contract completion.

 

The amounts charged to the provision for doubtful accounts were $1.2 million and $30,000 for the three-month periods ended September 30, 2017 and 2016, respectively, and $2.2 million and $0.3 million for the nine-month periods ended September 30, 2017 and 2016, respectively.