Note 6 - Inventories (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	March 31,		December 31,
	2017		2016
Raw materials	$	4,327,000	$	4,313,000
Work in process		2,499,000		2,535,000
Finished goods		3,853,000		4,146,000
	$	10,679,000	$	10,994,000