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Subsequent event (Details) - USD ($)
6 Months Ended
Jun. 03, 2024
May 31, 2024
Jun. 10, 2024
Nov. 30, 2023
Subsequent Event [Line Items]        
Cash and cash equivalents   $ 14,022,000   $ 2,590,000
Ambler Metals LLC        
Subsequent Event [Line Items]        
Cash and cash equivalents     $ 12,500,000  
Restricted Stock Units (RSUs) [Member]        
Subsequent Event [Line Items]        
Granted units   5,324,992    
Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member] | Senior management        
Subsequent Event [Line Items]        
Granted (in shares) 326,020      
Stock issued in lieu of salaries $ 153,000      
Subsequent Event [Member] | DSUs. | Director [Member]        
Subsequent Event [Line Items]        
Granted (in shares) 168,187      
Stock issued in lieu of director fees $ 82,668