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Note 6 - Inventories, net (Details) - Schedule of Inventory, Current - USD ($)
Dec. 31, 2018
Mar. 31, 2018
Schedule of Inventory, Current [Abstract]    
Purchased parts $ 2,799,562 $ 3,571,874
Work-in-process 769,714 1,051,725
Finished goods 0 66,335
Less: Inventory reserve (475,000) (420,000)
$ 3,094,276 $ 4,269,934