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Accounts payable and accrued liabilities (Details) - USD ($)
Mar. 01, 2024
Feb. 29, 2024
Dec. 01, 2023
Nov. 30, 2023
Subsequent Event [Line Items]        
Trade accounts payable   $ 159,000   $ 146,000
Accrued liabilities   60,000   54,000
Accrued salaries and vacation   245,000 $ 155,000 232,000
Accounts payable and accrued liabilities   $ 464,000   $ 432,000
Subsequent Event        
Subsequent Event [Line Items]        
Accrued salaries and vacation $ 155,000