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Note 4 - Inventories (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

As of

March 31,

2024

   

As of

December 31,

2023

 

Raw materials

  $ 278,755     $ 239,998  

Work-in-process

    -       -  

Finished goods

    162,963       254,376  

Total

  $ 441,718     $ 494,374