v3.25.1
Note 3 - Notes Receivable and Advances, Net (Details Textual) - RenFuel K2B AB Note Receivable [Member] - USD ($)
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Financing Receivable, before Allowance for Credit Loss $ 430,000    
Interest Income, Financing Receivable, before Allowance for Credit Loss 29,344 $ 4,267  
Interest Receivable, Current $ 87,348   $ 58,004