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Note 6 - Inventories, net (Details) - Schedule of Inventory, Current - USD ($)
Sep. 30, 2018
Mar. 31, 2018
Schedule of Inventory, Current [Abstract]    
Purchased parts $ 2,956,459 $ 3,571,874
Work-in-process 1,254,607 1,051,725
Finished goods 16,098 66,335
Less: Inventory reserve (465,000) (420,000)
$ 3,762,164 $ 4,269,934