Note 6 - Share Capital (Details Textual) - CAD ($)										1 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
		Jun. 05, 2019	Dec. 20, 2018	Nov. 26, 2018	Jun. 07, 2018	Dec. 07, 2017	Nov. 30, 2017	Jul. 06, 2017	Jun. 09, 2017	Apr. 30, 2019	Nov. 30, 2018	Nov. 30, 2018	Feb. 28, 2019	May 31, 2019		May 31, 2018
Sale of Stock, Price Per Share										$ 1.40	$ 0.86	$ 0.86
Proceeds from Issuance of Private Placement			$ 2,080,000		$ 4,500,002			$ 4,650,000
Payments of Stock Issuance Costs									$ 7,703					$ 31,059		$ 107,348
Stock Issued During Period, Value, Acquisitions	[1]													$ 59,500		$ 847,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period										615,000	4,036,900			4,651,900		256,660
Proceeds from Stock Options Exercised										$ 861,000	$ 3,453,924					$ 169,863
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term														3 years 91 days		1 year 270 days
Share-based Payment Arrangement, Option [Member]
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture														$ 7,442,708		$ 951,067
Employee Stock Option, Expiring on November 17, 2016 [Member]
Options Exercisable Period, After Restrictions Lifted													10 days
The 2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period										615,000		4,036,900				256,660
The 2010 Plan [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum														10.00%
The 2010 Plan [Member] | Share-based Payment Arrangement, Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period													10 years
North Bullfrog [Member]
Stock Issued During Period, Value, Acquisitions	[1],[2]													$ 59,500		$ 37,000
North Bullfrog [Member] | Corvus Gold Nevada Inc. [Member]
Payments of Stock Issuance Costs				$ 6,212
Stock Issued During Period, Shares, Acquisitions				25,000			25,000
Stock Issued During Period, Value, Acquisitions				$ 59,500			$ 37,000
Mother Lode Property [Member]
Stock Issued During Period, Shares, Acquisitions									1,000,000
Stock Issued During Period, Value, Acquisitions									$ 810,000						[3]	$ 810,000	[3]
Private Placement [Member]
Stock Issued During Period, Shares, New Issues		500,000	800,000		1,730,770			6,200,000
Sale of Stock, Price Per Share					$ 2.60			$ 0.75
Proceeds from Issuance of Private Placement		$ 900,000	$ 2,080,000		$ 4,500,002
Payments of Stock Issuance Costs			$ 10,242		$ 14,605	$ 84,857		$ 14,788
Shares Issued, Price Per Share		$ 1.80	$ 2.60		$ 2.60
Private Placement 1 [Member]
Stock Issued During Period, Shares, New Issues						2,829,130
Proceeds from Issuance of Private Placement						$ 3,253,499
Shares Issued, Price Per Share						$ 1.15
Private Placement 2 [Member]
Stock Issued During Period, Shares, New Issues						1,574,803
Proceeds from Issuance of Private Placement						$ 2,000,000
Shares Issued, Price Per Share						$ 1.27

[1] Pursuant to a mining lease and option to purchase agreement made effective December 1, 2007 between Corvus Nevada and a group of arm's length limited partnerships, Corvus Nevada has leased (and has the option to purchase) patented mining claims referred to as the "Mayflower" claims which form part of the North Bullfrog project. The terms of the lease/option are as follows: Terms: Initial term of five years, commencing December 1, 2007, with the option to extend the lease for an additional five years. Pursuant to an extension agreement dated January 15, 2016 and fully executed and effective as of November 22, 2017, the parties agreed to extend the lease and option granted for an additional ten years with the same lease payment terms. Lease Payments: Corvus Nevada will pay USD 10,000 and deliver 50,000 common shares of ITH (USD 10,000 paid on November 15, 2018 and 50,000 common shares of ITH, purchased for $34,116 in the market by the Company, were delivered on November 6, 2018). Anti-Dilution: Pursuant to an amended agreement agreed to by the lessors in March 2015, the Company, all future payments will be satisfied by the delivery of an additional 1/2 common shares of the Company for each of the ITH common shares due per the original agreement (issued 25,000 shares of the Company on November 26, 2018). Work Commitments: USD 100,000 per year for the first three years (incurred), USD 200,000 per year for the years four to six (incurred), USD 300,000 for the years seven to ten (incurred) and USD 300,000 for the years 11 - 20 (incurred). Excess expenditures in any year may be carried forward. If Corvus Nevada does not incur the required expenditures in year one, the deficiency is required to be paid to the lessors. Retained Royalty: Corvus Nevada will pay the lessors a NSR royalty of 2% if the average gold price is USD 400 per ounce or less, 3% if the average gold price is between USD 401 and USD 500 per ounce and 4% if the average gold price is greater than USD 500 per ounce.

[2] The Company's North Bullfrog project consists of certain leased patented lode mining claims and federal unpatented mining claims owned 100% by the Company.

[3] Pursuant to a purchase agreement made effective June 9, 2017 between Corvus Nevada and Goldcorp USA, Inc. ("Goldcorp USA"), Corvus Nevada has acquired 100% of the Mother Lode property (the "Mother Lode Property"). In addition, Corvus Nevada staked two additional adjacent claim blocks to the Mother Lode Property. In connection with the acquisition, the Company issued 1,000,000 common shares at a price of $0.81 per common share to Goldcorp USA (note 6). The Mother Lode Property is subject to an NSR in favour of Goldcorp USA. The NSR pays 1% from production at the Mother Lode Property when the price of gold is less than USD 1,400 per ounce and an additional 1% NSR for a total of 2% NSR when gold price is greater than or equal to USD 1,400 per ounce.