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Segment information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]    
Revenue $ 0 $ 0
Research and development (191,000) (203,000)
Net loss (1,934,000) (1,224,000)
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Revenue 0 0
Research and development (191,000) (203,000)
Payroll and related (296,000) (94,000)
Share-based compensation (292,000) (37,000)
Consulting related to intellectual property (439,000) (248,000)
Insurance (77,000) (76,000)
Operating expenses (281,000) (233,000)
Interest expense (358,000) (333,000)
Net loss $ (1,934,000) $ (1,224,000)