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Note 4 - Inventories, net (Details) - Schedule of Inventory, Current - USD ($)
Sep. 30, 2016
Mar. 31, 2016
Schedule of Inventory, Current [Abstract]    
Purchased parts $ 2,855,331 $ 3,420,249
Work-in-process 1,107,107 1,446,293
Finished goods 18,350 102,490
Less: Inventory reserve (305,000) (290,000)
$ 3,675,788 $ 4,679,032