Note 6 - Inventories (Tables)

6 Months Ended

Jun. 30, 2017

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	June 30,		December 31,
	2017		2016
Raw materials	$	4,333,000	$	4,313,000
Work in process		2,869,000		2,535,000
Finished goods		3,566,000		4,146,000
	$	10,768,000	$	10,994,000