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Note 2 - Summary of Significant Accounting Policies (Details Textual)	3 Months Ended		9 Months Ended		22 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Number of Operating Segments			1
Number of Geographic Segments			1
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 0	$ 90,000	$ 0	$ 108,000
Percentage of Revenue From Products Transferred at Point in Time				100.00%
Accounts Receivable, after Allowance for Credit Loss, Current, Total	250,000		250,000		$ 250,000	$ 32,000
Proceeds from Insurance Settlement, Investing Activities			0	$ 9,838,000
AquaRefining Fire [Member]
Proceeds from Insurance Settlement, Investing Activities	5,250,000				30,250,000
Trade Accounts Receivable [Member]
Accounts Receivable, after Allowance for Credit Loss, Current, Total	$ 0		$ 0		$ 0
P. Kay Metals [Member]
Percentage of Revenue From Products Transferred at Point in Time				84.00%
Clarios [Member]
Percentage of Revenue From Products Transferred at Point in Time				16.00%

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