Note 4 - Inventories, net (Tables)

6 Months Ended

Sep. 30, 2014

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consist of:

	September 30, 2014			March 31, 2014
Purchased parts	$	3,375,294		$	3,085,070
Work-in-process		1,333,415			1,134,714
Finished goods		45,558			10,607
Less: Inventory reserve		(210,000	)		(205,000	)
	$	4,544,267		$	4,025,391