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 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 4 $ 0 $ 4 $ 0  
AquaRefining Fire [Member]          
Proceeds from Insurance Settlement, Investing Activities         $ 30,250
Sale of Inventory [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 0 $ 0 $ 0