Note 4 - Inventories, net (Details) - Schedule of Inventory, Current (USD $)	Jun. 30, 2013	Mar. 31, 2013
Schedule of Inventory, Current [Abstract]
Purchased parts	$ 4,227,353	$ 4,418,989
Work-in-process	1,404,489	1,636,325
Finished goods	45,401	385,867
Less: Inventory reserve	(200,000)	(200,000)
	$ 5,477,243	$ 6,241,181