Note 5 - Inventories, net (Tables)

6 Months Ended

Sep. 30, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consist of:

	September 30, 2017			March 31, 2017
Purchased parts	$	3,682,890		$	3,197,378
Work-in-process		1,040,989			1,272,235
Finished goods		87,498			68,566
Less: Inventory reserve		(355,000	)		(330,000	)
	$	4,456,377		$	4,208,179