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Inventories, net (Tables)
3 Months Ended
Jun. 30, 2022
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]

Inventories consist of:

   

June 30,

2022

   

March 31,

2022

 
                 

Purchased parts

  $ 2,450,523     $ 2,371,105  

Work-in-process

    733,425       962,460  

Less: Inventory reserve

    (488,020

)

    (513,068

)

    $ 2,695,928     $ 2,820,497