Quarterly report pursuant to Section 13 or 15(d)

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

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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 0 $ 0  
AquaRefining Fire [Member]      
Proceeds from Insurance Settlement, Investing Activities     $ 30,250