Note 9 - Subsidiaries - Significant Subsidiaries (Details)	12 Months Ended
	May 31, 2019	May 31, 2018
Corvus Gold (USA) Inc. [Member]
Principal Activity	Holding company
Effective Interest	100.00%	100.00%
Raven Gold Alaska Inc. [Member]
Principal Activity	Exploration company
Effective Interest	100.00%	100.00%
Corvus Gold Nevada Inc. [Member]
Principal Activity	Exploration company
Effective Interest	100.00%	100.00%
SoN Land and Water LLC [Member]
Principal Activity	Exploration company
Effective Interest	100.00%	100.00%
Mother Lode Mining Company LLC [Member]
Principal Activity	Exploration company
Effective Interest	100.00%	100.00%