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Note 4 - Inventories, net (Details) - Schedule of Inventory, Current (USD $)
Dec. 31, 2014
Mar. 31, 2014
Schedule of Inventory, Current [Abstract]    
Purchased parts $ 3,360,506us-gaap_OtherInventorySupplies $ 3,085,070us-gaap_OtherInventorySupplies
Work-in-process 1,387,572us-gaap_InventoryWorkInProcess 1,134,714us-gaap_InventoryWorkInProcess
Finished goods 45,287us-gaap_InventoryFinishedGoods 10,607us-gaap_InventoryFinishedGoods
Less: Inventory reserve (210,000)us-gaap_InventoryValuationReserves (205,000)us-gaap_InventoryValuationReserves
$ 4,583,365us-gaap_InventoryNet $ 4,025,391us-gaap_InventoryNet