Quarterly report [Sections 13 or 15(d)]

Note 6 - Stockholders' Equity and Equity-linked Instruments (Details Textual)

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Note 6 - Stockholders' Equity and Equity-linked Instruments (Details Textual)
 1 Months Ended 3 Months Ended
Jan. 16, 2026
Feb. 14, 2025
USD ($)
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Mar. 31, 2026
USD ($)
$ / shares
shares
Mar. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2025
$ / shares
shares
Oct. 22, 2025
USD ($)
$ / shares
shares
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares       $ 0.001   $ 0.001 $ 0.001
Preferred Stock, Shares Issued (in shares) | shares       1,223   98,636  
Preferred Stock, Shares Outstanding (in shares) | shares       1,223   98,636  
Preferred Stock, Stated Value | $             $ 1,000
Fair Value Adjustment of Warrants | $       $ (4,000) $ (717,000)    
Series AAA-3 and AAA-4 Junior Preferred Stock Warrants [Member]              
Fair Value Adjustment of Warrants | $       0 270,000    
Warrants Issued With Placement Agent Agreement [Member]              
Fair Value Adjustment of Warrants | $       $ 4,000 $ 447,000    
Series C Preferred Stock [Member]              
Preferred Stock, Shares Issued (in shares) | shares       1,153   1,153  
Preferred Stock, Shares Outstanding (in shares) | shares       1,153   1,153  
Series C Preferred Stock [Member] | Minimum [Member]              
Ownership Percentage             4.99%
Series C Preferred Stock [Member] | Maximum [Member]              
Ownership Percentage             9.99%
Series C Preferred Stock [Member] | YP Exchange Agreement [Member]              
Shares Designated | shares             4,700
Preferred Stock, Convertible, Conversion Price, At Issuance | $ / shares             $ 12
Equity Purchase Agreement [Member]              
Equity Offering, Maximum Amount | $   $ 2,900,000          
Stock Issued During Period, Shares, New Issues | shares   625     1,494    
Stock Issued During Period, Value, New Issues | $   $ 159,000          
Shares Issued, Price Per Share | $ / shares         $ 163.2    
Proceeds from Issuance of Common Stock | $         $ 231,000    
Series AAA-3 & AAA-4 Junior Subscription Agreements [Member]              
Stock Issued During Period, Shares, New Issues | shares     1,096        
Proceeds from Issuance or Sale of Equity | $     $ 1,096,000        
Series AAA-3 & AAA-4 Junior Subscription Agreements [Member] | Series AAA-3 and AAA-4 Junior Preferred Stock Warrants [Member]              
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | shares     3        
Class of Warrant or Right, Issued During Period, Purchase Price | $ / shares     $ 1,000        
Reverse Stock Split [Member]              
Stockholders' Equity Note, Stock Split, Conversion Ratio 12