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Income taxes (Details Narrative) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Tax Credit Carryforward [Line Items]    
Statutory income tax rates, percentage 25.00% 25.00%
Gross loss carryforwards $ 130,100,000  
R&D credit carryforward $ 31,700,000  
Minimum [Member]    
Tax Credit Carryforward [Line Items]    
Income tax returns limitation periods 3 years  
Maximum [Member]    
Tax Credit Carryforward [Line Items]    
Income tax returns limitation periods 6 years  
UNITED KINGDOM    
Tax Credit Carryforward [Line Items]    
Foreign tax benefit $ 1,851,038
Statutory income tax rates, percentage 25.00% 25.00%
Gross loss carryforwards $ 108,400,000  
Cash, cash equivalents and restricted cash 117,304 $ 184,218
UNITED KINGDOM | Research Tax Credit Carryforward [Member]    
Tax Credit Carryforward [Line Items]    
R&D credit carryforward 0  
NIGERIA    
Tax Credit Carryforward [Line Items]    
Gross loss carryforwards 5,700,000  
PORTUGAL    
Tax Credit Carryforward [Line Items]    
Gross loss carryforwards 500,000  
SOUTH AFRICA    
Tax Credit Carryforward [Line Items]    
Gross loss carryforwards 6,900,000  
ARGENTINA    
Tax Credit Carryforward [Line Items]    
Gross loss carryforwards $ 7,100,000  
Gross loss carryforwards limitations on use expiration period is five years, and expiration dates ranging from calendar 2026 through calendar 2030.  
Other Foreign Entities [Member]    
Tax Credit Carryforward [Line Items]    
Gross loss carryforwards $ 1,500,000