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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount before tax of other comprehensive income (loss) attributable to parent entity.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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No definition available.

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Equity method investment - Narrative (Details) - USD ($)		1 Months Ended	3 Months Ended			6 Months Ended
	Feb. 11, 2020	Feb. 29, 2020	May 31, 2021	Feb. 28, 2021	May 31, 2020	May 31, 2021	May 31, 2020	Nov. 30, 2020
Schedule of Equity Method Investments [Line Items]
Investment in Ambler Metals LLC.			$ 170,325,000			$ 170,325,000		$ 173,145,000
Feasibility costs					$ 742,000		$ 742,000
Mineral properties expense							1,545,000
Comprehensive loss			$ (3,413,000)		(3,002,000)	(7,929,000)	168,177,000
Service agreement
Related party transactions - services agreement income
Amount charged for expenses						$ 22,151
Ambler Metals LLC
Schedule of Equity Method Investments [Line Items]
Percentage of ownership	50.00%		50.00%			50.00%
Investment in Ambler Metals LLC.	$ 176,000,000		$ 170,325,000			$ 170,325,000
Mineral properties expense		$ 0			0
Comprehensive loss			3,400,000		$ 1,100,000	$ 5,600,000	1,500,000
Related party transactions - services agreement income
Amount charged for expenses			$ 0	$ 4,053
Upper Kobuk Mineral Projects \| South32
Schedule of Equity Method Investments [Line Items]
Percentage of ownership	50.00%
Upper Kobuk Mineral Projects \| South32 \| Ambler Metals LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment contribution	$ 145,000,000
Arctic Project
Schedule of Equity Method Investments [Line Items]
Feasibility costs							$ 700,000