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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
12 Months Ended
Apr. 05, 2024
Dec. 31, 2024
Dec. 31, 2023
Summary Of Significant Accounting Policies [Line Items]      
Reverse stock split 1-for-15    
Reverse stock split fractional share settlement 15    
Restricted cash   $ 26,000 $ 26,000
Deferred equity issuance costs   75,000 112,000
Additional Paid-in Capital [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Deferred equity issuance costs againist additional paid-in capital     $ 6,000
February 2024 Warrant Inducement [Member] | Additional Paid-in Capital [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Deferred equity issuance costs againist additional paid-in capital   $ 37,000