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Note 3 - Inventory | 12 Months Ended
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Dec. 31, 2021
Notes to Financial Statements |
Inventory Disclosure [Text Block] | NOTE 3 - INVENTORY Inventory consisted of the following at December 31, 2021 and December 31, 2020:
|  | 2021 |  |  | 2020 |
Furnace parts and supplies |  | $ | 213,224 |  |  | $ | 471,622 |
Raw materials |  |  | 2,144,067 |  |  |  | 1,955,713 |
Work in process |  |  | 1,671,290 |  |  |  | 2,394,481 |
Finished goods and filtration systems |  |  | 1,660,907 |  |  |  | 1,424,171 |
Reserve for excess and obsolescence |  |  | (268,470 | ) |  |  | (723,949 | )
Net Inventory |  | $ | 5,421,027 |  |  | $ | 5,522,038 |
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. The reduction in the reserve for excess and obsolescence reflects the reuse of goods previously classified as obsolete due to shift in demand pattern from external clients.

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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 http://asc.fasb.org/topic&trid=2126998 + Details
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