Inventories (Tables)

12 Months Ended

Dec. 31, 2017

INVENTORIES [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consisted of the following at December 31, 2017 and 2016 (in thousands):

	2017		2016
Finished goods	$	21,668	$	21,635
Parts and materials	10,613		11,185
Work in progress	1,036		900
Total inventories	$	33,317	$	33,720