Annual report [Section 13 and 15(d), not S-K Item 405]

Note 10 - Notes Payable (Details Textual)

Note 10 - Notes Payable (Details Textual)								3 Months Ended		12 Months Ended
Note 10 - Notes Payable (Details Textual)	Oct. 15, 2025 USD ($) $ / shares shares	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 ($)	Sep. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($) shares	Dec. 31, 2024 USD ($)
Repayments of Notes Payable										$ 4,500,000	$ (0)
Gain (Loss) on Extinguishment of Debt										$ (825,000)	0
Common Stock Purchase Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) \| shares	1					75,000				75,000
Warrants and Rights Outstanding, Term (Year)						5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares	$ 11.34
Proceeds from Issuance of Warrants	$ 5,682,000					$ 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
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
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