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Note 2 - Inventory | 12 Months Ended
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Dec. 31, 2019
Notes to Financial Statements |
Inventory Disclosure [Text Block] | NOTE 2 - INVENTORY Inventory consisted of the following at December 31, 2019 and December 31, 2018:
|  | 2019 |  |  | 2018 |
Furnace parts and supplies |  | $ | 621,991 |  |  | $ | 596,806 |
Raw materials |  |  | 2,125,921 |  |  |  | 1,659,826 |
Work in process |  |  | 1,624,499 |  |  |  | 1,691,175 |
Finished goods and filtration systems |  |  | 1,492,135 |  |  |  | 1,596,042 |
Reserve for excess and obsolescence |  |  | (665,308 | ) |  |  | (1,111,794 | )
Net Inventory |  | $ | 5,199,238 |  |  | $ | 4,432,055 |
Inventory valuation adjustments for excess and obsolete inventory is calculated based on current inventory levels, movements, expected useful lives, and estimated future demand of the products. The valuation reserve has declined in 2019 compared to 2018 due to the scrapping of several slow-moving products previously written off.

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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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