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Note 6 - Inventories, net
6 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block]

Note 6 – Inventories, net


Inventories consist of:


   

September 30,

2019

   

March 31,

2019

 
                 

Purchased parts

  $ 2,525,184     $ 2,709,235  

Work-in-process

    1,042,431       721,397  

Finished goods

    32,783       -  

Less: Inventory reserve

    (525,000

)

    (498,000 )
    $ 3,075,398     $ 2,932,632