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Note 5 - Investment in Donlin Gold - Summary of the Company's Investment in Donlin Gold LLC (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
May 31, 2023
May 31, 2022
May 31, 2023
May 31, 2022
Nov. 30, 2022
Statement [Line Items]          
Current assets: Cash, prepaid expenses, and other receivables $ 135,180   $ 135,180   $ 152,538
Current liabilities: Accounts payable, accrued liabilities and lease obligations (610)   (610)   (769)
Income (Loss) from Equity Method Investments (7,543) $ (8,441) (12,018) $ (12,481)  
Donlin Gold [Member]          
Statement [Line Items]          
Current assets: Cash, prepaid expenses, and other receivables 5,929   5,929   4,220
Non-current assets: Right-of-use assets, property and equipment 1,745   1,745   2,036
Non-current assets: Mineral property 32,615   32,615   32,615
Current liabilities: Accounts payable, accrued liabilities and lease obligations (2,966)   (2,966)   (2,322)
Non-current liabilities: Reclamation and lease obligations (721)   (721)   (701)
Net assets 36,602   36,602   $ 35,848
Donlin Gold [Member]          
Statement [Line Items]          
Balance – beginning of period 5,117 5,472 3,848 3,576  
Mineral property expenditures (7,391) (8,343) (11,715) (12,287)  
Depreciation (144) (86) (283) (171)  
Accretion (8) (12) (20) (23)  
Income (Loss) from Equity Method Investments (7,543) (8,441) (12,018) (12,481)  
Funding 7,028 10,551 12,772 16,487  
Balance – end of period $ 4,602 $ 7,582 $ 4,602 $ 7,582