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Note 2 - Inventory | 6 Months Ended
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Jun. 30, 2020
Notes to Financial Statements |
Inventory Disclosure [Text Block] | NOTE 2 - INVENTORY Inventory consisted of the following at June 30, 2020 and December 31, 2019:
|  | June 30, 2020 |  |  | December 31, 2019 |
Furnace parts and supplies |  | $ | 834,710 |  |  | $ | 621,991 |
Raw materials |  |  | 1,980,305 |  |  |  | 2,125,921 |
Work in process |  |  | 2,124,366 |  |  |  | 1,624,499 |
Finished goods and filtration systems |  |  | 1,084,111 |  |  |  | 1,492,135 |
Reserve for obsolescence |  |  | (666,878 | ) |  |  | (665,308 | )
Net Inventory |  | $ | 5,356,614 |  |  | $ | 5,199,238 |
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.

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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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