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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%