Note 4 - Inventories (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Inventory, Current [Table Text Block]

Inventories consist of:
	2018			2017
Raw materials	$	2,016,488		$	3,156,016
Work-in-process		205,385			389,630
Finished goods		-			26,977
Gross inventories		2,221,873			3,572,623
Less reserve for obsolescence		(360,000	)		(607,000	)
Inventories, net	$	1,861,873		$	2,965,623