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Note 6 - Inventories (Tables)
6 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

September 30,

2021

  

March 31,

2021

 

Raw materials

 $814,313  $660,678 

Work in process

  2,587,889   2,220,723 

Finished goods

  580,569   1,019,376 

Total inventories

 $3,982,771  $3,900,777