Inventories and Contracts in Progress (Tables)

12 Months Ended

Dec. 31, 2017

Inventories and Contracts in Progress [Abstract]

Schedule of Inventories and Contracts in Progress [Table Text Block]

Inventories and contracts in progress consist of the following:

	As of December 31
(in thousands)	2017		2016
Raw materials	$	30,429	$	20,646
Work-in-process	10,258		5,368
Finished goods	18,851		8,490
Contracts in progress	1,074		314
	$	60,612	$	34,818