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

Note 2 - Summary of Significant Accounting Policies - Reconciliation of Net Loss (Details)

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Note 2 - Summary of Significant Accounting Policies - Reconciliation of Net Loss (Details) - USD ($)
 1 Months Ended 12 Months Ended
Oct. 20, 2025
Jul. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Net loss     $ (20,717,000) $ (16,635,000)
Deemed dividend on Series AA Preferred Stock – down round feature   $ (308,000) (308,000) 0
Deemed dividend on exchange of Series AA, AAA and AAA Junior Preferred Stock for Series B Preferred Stock $ 6,296,000   7,685,000  
Deemed dividend – Issuance of Series B Warrants     (6,296,000) 0
Preferred stock dividends paid or accrued– common stock     (291,000) (4,386,000)
Net loss attributable to common stockholders - basic     (19,927,000) (21,021,000)
Series AA, AAA and AAA Junior Convertible Preferred Stock [Member]        
Deemed dividend on exchange of Series AA, AAA and AAA Junior Preferred Stock for Series B Preferred Stock     $ 7,685,000 $ 0