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Note 2 - Inventories (Tables)
12 Months Ended
Dec. 31, 2024
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

December 31,

  

December 31,

 
  

2024

  

2023

 

Furnace parts and supplies

 $-  $55,177 

Raw materials

  2,734,781   3,301,526 

Work in process

  2,435,280   1,271,458 

Finished goods and filtration systems

  1,580,255   1,507,113 

Reserve for obsolescence

  (1,209,124)  (867,458)

Total inventories, net

 $5,541,192  $5,267,816