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Note 5 - Inventories, net (Details) - Schedule of Inventory, Current - USD ($)
Jun. 30, 2017
Mar. 31, 2017
Schedule of Inventory, Current [Abstract]    
Purchased parts $ 3,133,106 $ 3,197,378
Work-in-process 1,358,129 1,272,235
Finished goods 9,095 68,566
Less: Inventory reserve (335,000) (330,000)
$ 4,165,330 $ 4,208,179