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Note 4 - Inventory | 9 Months Ended
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Sep. 30, 2022
Notes to Financial Statements |
Inventory Disclosure [Text Block] | NOTE 4 - INVENTORY Inventory consisted of the following on September 30, 2022, and December 31, 2021:
|  | September 30, 2022 |  |  | December 31, 2021 |
Furnace parts and supplies |  | $ | 609,550 |  |  | $ | 213,224 |
Raw materials |  |  | 2,157,268 |  |  |  | 2,144,067 |
Work in process |  |  | 936,059 |  |  |  | 1,671,290 |
Finished goods and filtration systems |  |  | 1,532,387 |  |  |  | 1,660,907 |
Reserve for obsolescence |  |  | (578,076 | ) |  |  | (268,470 | )
Net Inventory |  | $ | 4,657,188 |  |  | $ | 5,421,027 |
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. During the third quarter the Company made further provisions for excess and obsolete inventory in a period with changing market fundamentals.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI https://asc.fasb.org/topic&trid=2126998 + Details
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