Annual report pursuant to Section 13 and 15(d)

Cover
- Document And Entity Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- Significant Accounting Policies (Policies)
Notes Tables
Notes Details

Note 2 - Summary of Significant Accounting Policies (Details Textual)

v3.20.4

Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands		2 Months Ended	3 Months Ended				12 Months Ended
	Nov. 29, 2019 USD ($)	Feb. 25, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Impairment of Long-Lived Assets Held-for-use			$ 11,741	$ (0)	$ (0)	$ (0)	$ 11,741	$ (0)
Proceeds from Insurance Settlement, Investing Activities							$ 9,838	2,500
Number of Operating Segments							1
Number of Geographic Segments							1
Accounts Receivable, after Allowance for Credit Loss, Current, Total			32				$ 32	$ 244
Cost of Goods and Service Benchmark [Member] \| Supplier Concentration Risk [Member] \| Chemicals [Member]
Number of Major Suppliers							1
Cost of Goods and Service Benchmark [Member] \| Supplier Concentration Risk [Member] \| Lead Acid Batteries [Member]
Number of Major Suppliers							2
Trade Accounts Receivable [Member]
Accounts Receivable, after Allowance for Credit Loss, Current, Total			$ 0				$ 0
AquaRefining Fire [Member]
Property, Plant and Equipment, Net Write-off	$ 19,900
Proceeds from Insurance Settlement, Investing Activities							23,400
AquaRefining Fire [Member] \| Subsequent Event [Member]
Proceeds from Insurance Settlement, Investing Activities		$ 100
Construction in Progress Not Yet Capitalized [Member]
Property, Plant and Equipment, Net Write-off							7,700
Property, Plant and Equipment, Other Types [Member]
Property, Plant and Equipment, Net Write-off							$ 4,000

- Definition

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