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Note 3 - Inventory
3 Months Ended
Mar. 31, 2024
Notes to Financial Statements  
Inventory Disclosure [Text Block]

NOTE 3 - INVENTORY

 

Inventory consisted of the following on March 31, 2024, and December 31, 2023:

 

   

March 31,

2024

   

December 31,

2023

 

Furnace parts and supplies

  $ 53,969     $ 55,177  

Raw materials

    3,253,365       3,301,526  

Work in process

    1,415,130       1,271,458  

Finished goods and filtration systems

    1,579,779       1,507,113  

Reserve for obsolescence

    (792,354 )     (867,458 )

Net Inventory

  $ 5,509,889     $ 5,267,816  

 

Inventory valuation adjustments for excess and obsolete inventory are calculated based on current inventory levels, movements, expected useful lives, and estimated future demand for the products.