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Note 6 - Inventories, net
6 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventory Disclosure [Text Block]

Note 6 – Inventories, net


Inventories consist of:


   

September 30,

2018

   

March 31,

2018

 
                 

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