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Note 12 - Subsequent Events (Details Textual)
 6 Months Ended
Oct. 05, 2030
Oct. 04, 2030
CAD ($)
Oct. 04, 2027
CAD ($)
Nov. 04, 2024
CAD ($)
shares
Oct. 07, 2024
CAD ($)
a
shares
Oct. 04, 2024
CAD ($)
shares
Sep. 30, 2024
CAD ($)
Mar. 31, 2024
CAD ($)
Statement Line Items [Line Items]                
Total borrowings | $             $ 1,160,366 $ 1,138,520
Athabasca properties [member] | Denison Mines Corp. [member]                
Statement Line Items [Line Items]                
Proportion of ownership interest in associate             100.00%  
Hatchet Lake [member] | Denison Mines Corp. [member]                
Statement Line Items [Line Items]                
Proportion of ownership interest in associate             70.15%  
New Foremost share [member] | Foremost warrant ]member]                
Statement Line Items [Line Items]                
Class of warrant or right, number of securities called by each warrant or right 1 (in shares)       1        
Rio Grande common share [member] | Foremost warrant ]member]                
Statement Line Items [Line Items]                
Class of warrant or right, number of securities called by each warrant or right 1 (in shares)       2        
Entering into significant commitments or contingent liabilities [member] | New Foremost share [member]                
Statement Line Items [Line Items]                
Number of shares per option (in shares)       1        
Entering into significant commitments or contingent liabilities [member] | Rio Grande common share [member]                
Statement Line Items [Line Items]                
Number of shares per option (in shares)       1        
Entering into significant commitments or contingent liabilities [member] | Foremost option [member]                
Statement Line Items [Line Items]                
Number of options to be transferred and exchanged       0.9136        
Number of options received in exchange (in shares)       1        
Entering into significant commitments or contingent liabilities [member] | Foremost option 2 [member]                
Statement Line Items [Line Items]                
Number of options to be transferred and exchanged       0.0864        
Entering into significant commitments or contingent liabilities [member] | Rio Grande options [member]                
Statement Line Items [Line Items]                
Number of options received in exchange (in shares)       2        
Entering into significant commitments or contingent liabilities [member] | Foremost RSU [member]                
Statement Line Items [Line Items]                
Number of units to be transferred and exchanged       0.9136        
Entering into significant commitments or contingent liabilities [member] | Foremost replacement RSU [member]                
Statement Line Items [Line Items]                
Number of units received in exchange (in shares)       1        
Entering into significant commitments or contingent liabilities [member] | Foremost RSU 1 [member]                
Statement Line Items [Line Items]                
Number of units to be transferred and exchanged       0.0864        
Entering into significant commitments or contingent liabilities [member] | Rio Grande RSU [member]                
Statement Line Items [Line Items]                
Number of units received in exchange (in shares)       2        
Entering into significant commitments or contingent liabilities [member] | Rio Grande Resources Ltd [member] | Barnard promissory note [member]                
Statement Line Items [Line Items]                
Borrowings, interest rate       8.95%        
Entering into significant commitments or contingent liabilities [member] | Rio Grande Resources Ltd [member] | Foremost promissory note [member]                
Statement Line Items [Line Items]                
Total borrowings | $       $ 520,000        
Entering into significant commitments or contingent liabilities [member] | Rio Grande Resources Ltd [member] | Key management personnel of entity or parent [member] | Barnard promissory note [member]                
Statement Line Items [Line Items]                
Total borrowings | $       $ 677,450        
Borrowings, interest rate       8.95%        
Major purchases of assets [member] | Denison Mines Corp. [member] | Foremost [member]                
Statement Line Items [Line Items]                
Proportion of ownership interest in associate         19.95%      
Major purchases of assets [member] | Athabasca properties [member]                
Statement Line Items [Line Items]                
Proportion of ownership interest in associate   19.00% 31.00%     20.00%    
Number of uranium exploration properties         10      
Area of land (Acre) | a         330,000      
Increase (decrease) in number of shares outstanding, acquisitions (in shares)           1,369,810    
Increase (decrease) through acquisition of subsidiary, equity | $           $ 5,263,209    
Payments for exploration and evaluation expenses | $   $ 2,500,000 $ 2,000,000          
Capital commitments | $   $ 1,200,000 $ 8,000,000          
Increase (decrease) in number of shares outstanding, advisory fees (in shares)         425,682      
Increase (decrease) through advisory fees, equity | $         $ 1,670,119      
Major purchases of assets [member] | Athabasca properties [member] | Denison Mines Corp. [member]                
Statement Line Items [Line Items]                
Proportion of ownership interest in associate 51.00%              
Major purchases of assets [member] | Athabasca properties [member] | Top of range [member]                
Statement Line Items [Line Items]                
Proportion of ownership interest in associate         70.00%      
Major purchases of assets [member] | Hatchet Lake [member]                
Statement Line Items [Line Items]                
Proportion of ownership interest in associate   15.22% 21.75%     14.03%    
Proportion of ownership interest in associate above current interest         70.00%      
Major purchases of assets [member] | Hatchet Lake [member] | Top of range [member]                
Statement Line Items [Line Items]                
Proportion of ownership interest in associate         51.00%      
Sierra Gold & Silver Ltd. [member] | Entering into significant commitments or contingent liabilities [member]                
Statement Line Items [Line Items]                
Proportion of voting rights held in subsidiary       100.00%        
Sierra Gold & Silver Ltd. [member] | Entering into significant commitments or contingent liabilities [member] | Rio Grande Resources Ltd [member]                
Statement Line Items [Line Items]                
Denominator of formula for shares issued (in shares)       0.8005        
Numerator of formula for shares issued (in shares)       2