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Note 5 - Inventories (Tables)
9 Months Ended
Sep. 30, 2024
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

September 30,

  

December 31,

 
  

2024

  

2023

 

Furnace parts and supplies

 $23,950  $55,177 

Raw materials

  3,272,852   3,301,526 

Work in process

  2,397,553   1,271,458 

Finished goods and filtration systems

  1,699,003   1,507,113 

Reserve for obsolescence

  (1,129,745)  (867,458)

Total inventories, net

 $6,263,613  $5,267,816