v3.25.2
Note 2 - Basis of Preparation - Ownership Interests (Details)
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Sierra Gold & Silver Ltd. [member]      
Statement Line Items [Line Items]      
Proportion of ownership interest in subsidiary   100.00% 100.00%
Rio Grande Resources Ltd [member]      
Statement Line Items [Line Items]      
Proportion of ownership interest in subsidiary [1] 19.95%    
[1] Rio Grande was newly incorporated on July 19, 2024 for the purpose of the spin-out that was completed on January 31, 2024 (Note 17). Both Sierra and Rio Grande were consolidated into Foremost through January 31, 2024.