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Inventory (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Current portion of inventory | $ 7,922,000 | $ 7,814,000
Inventory, Net, Total | 7,922,000 | 7,814,000
Plant Inventory [Member] |  |
Inventory, Net, Total | 0 | 463,000
Conversion Facility Inventory [Member] |  |
Inventory, Net, Total | 7,922,000 | 7,351,000
Non-current portion of inventory [Member] |  |
Inventory, Net, Total | $ 7,922,000 | $ 7,814,000

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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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