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Note 6 - Inventories (Tables)
6 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  September 30, 2022  March 31, 2022

Raw materials

$1,324,358 $987,062

Work in process

 3,829,498  3,355,838

Finished goods

 640,993  745,735

Total inventories

$5,794,849 $5,088,635