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Note 4 - Inventories, net (Details) - Schedule of Inventory, Current - USD ($)
Dec. 31, 2016
Mar. 31, 2016
Schedule of Inventory, Current [Abstract]    
Purchased parts $ 2,999,640 $ 3,420,249
Work-in-process 1,491,461 1,446,293
Finished goods 292,786 102,490
Less: Inventory reserve (310,000) (290,000)
$ 4,473,887 $ 4,679,032