Quarterly report [Sections 13 or 15(d)]

Note 10 - Notes Payable (Details Textual)

v3.25.2
Note 10 - Notes Payable (Details Textual)
3 Months Ended 6 Months Ended
Jul. 27, 2025
USD ($)
Jun. 11, 2025
USD ($)
May 05, 2025
USD ($)
May 02, 2025
USD ($)
Dec. 18, 2024
USD ($)
$ / shares
shares
Feb. 01, 2023
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 19, 2024
shares
Gain (Loss) on Extinguishment of Debt             $ (825,000)   $ 0 $ (825,000) $ 0    
Common Stock Purchase Warrants [Member]                          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares         75,000               75,000
Warrants and Rights Outstanding, Term (Year)         5 years                
Proceeds from Issuance of Warrants         $ 986,000                
Common Stock Purchase Warrants [Member] | Minimum [Member]                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares         $ 19.2                
Common Stock Purchase Warrants [Member] | Maximum [Member]                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares         $ 19.3                
Loan Agreement [Member] | Summit Investment Services, LLC [Member] | Aqua Metals Reno, Inc [Member]                          
Debt Instrument, Face Amount           $ 3,000,000 3,000,000     3,000,000      
Debt Instrument, Interest Rate, Stated Percentage 10.50%         9.50%              
Debt Instrument Term, Interest Only Payments (Year)           24 years              
Debt Instrument, Guaranteed Minimum Interest           $ 213,750              
Secured Promissory Notes [Member]                          
Debt Instrument, Face Amount         $ 1,500,000   1,000,000     $ 1,000,000      
Debt Instrument, Interest Rate, Stated Percentage         20.00%                
Repayments of Debt     $ 1,000,000                    
Interest Paid, Including Capitalized Interest, Operating and Investing Activities       $ 300,000                  
Number of Accredited Investors         8                
Proceeds from Issuance of Private Placement         $ 1,500,000                
Proceeds from Issuance of Debt         514,000                
Payments Of Issuance Costs         58,000                
Long-Term Debt, Gross                       $ 1,500,000  
Repayments of Notes Payable               $ 500,000          
Gain (Loss) on Extinguishment of Debt             $ (825,000)            
Secured Promissory Notes [Member] | Certain Officers and Directors [Member]                          
Debt Instrument, Face Amount         1,250,000                
Secured Promissory Notes [Member] | Director Appointed in February 2025 [Member]                          
Debt Instrument, Face Amount         $ 400,000                
Secured Promissory Notes [Member] | Aqua Metals Reno, Inc [Member]                          
Repayments of Debt   $ 3,000,000                      
Interest Paid, Including Capitalized Interest, Operating and Investing Activities   $ 49,000                      
Secured Promissory Notes [Member] | Loan Agreement with Summit Investment Services, LLC [Member] | Aqua Metals Reno, Inc [Member]                          
Debt Instrument, Guaranteed Minimum Interest $ 76,125