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Note 5 - Inventories, net (Details) - Schedule of Inventory, Current - USD ($)
Sep. 30, 2017
Mar. 31, 2017
Schedule of Inventory, Current [Abstract]    
Purchased parts $ 3,682,890 $ 3,197,378
Work-in-process 1,040,989 1,272,235
Finished goods 87,498 68,566
Less: Inventory reserve (355,000) (330,000)
$ 4,456,377 $ 4,208,179