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

Note 6 – Inventories, net


Inventories consist of:


   

June 30, 2019

   

March 31, 2019

 
                 

Purchased parts

  $ 2,527,004     $ 2,709,235  

Work-in-process

    1,071,626       721,397  

Finished goods

    7,344       -  

Less: Inventory reserve

    (508,000

)

    (498,000

)

    $ 3,097,974     $ 2,932,632