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

Raw materials

$ 988,317   $ 987,062

Work in process

  3,863,801     3,355,838

Finished goods

  691,919     745,735

Total inventories

$ 5,544,037   $ 5,088,635