Contract Receivables and Billings in Excess of Revenue Recognized (Tables)

3 Months Ended

Mar. 31, 2017

Receivables [Abstract]

Schedule of Contract Receivables [Table Text Block]

At March 31, 2017 and December 31, 2016, contract receivables consist of the following (in thousands):

	March 31, 2017		December 31, 2016
Billed accounts receivable	$	18,499	$	21,588
Unbilled accounts receivable		9,625		7,262
		28,124		28,850
Less: allowance for doubtful accounts		(66)		(66)
	$	28,058	$	28,784