Note 6 - Mineral Rights and Properties - Mineral Rights and Property Acquisition Costs (Details) - USD ($) $ in Thousands	6 Months Ended	9 Months Ended
	Jan. 31, 2023	Apr. 30, 2023
Balance	$ 188,336	$ 188,336
Additions (Note 3 and 4)	386,497
Foreign exchange difference	(8,993)
Balance		565,840
Balance	(6,388)	(6,388)
Additions		(1)
Balance		(6,389)
Balance	181,948	181,948
Balance		559,451
UNITED STATES
Balance	172,340	172,340
Additions (Note 3 and 4)	50
Foreign exchange difference	0
Balance		172,390
Balance	(6,388)	(6,388)
Additions		(1)
Balance		(6,389)
Balance	165,952	165,952
Balance		166,001
CANADA
Balance	982	982
Additions (Note 3 and 4)	386,447
Foreign exchange difference	(8,993)
Balance		378,436
Balance	0	0
Additions		0
Balance		0
Balance	982	982
Balance		378,436
PARAGUAY
Balance	15,014	15,014
Additions (Note 3 and 4)	0
Foreign exchange difference	0
Balance		15,014
Balance	0	0
Additions		0
Balance		0
Balance	$ 15,014	15,014
Balance		$ 15,014