Note 12 - Capital Stock (Details Textual) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
	Mar. 11, 2025	Jan. 31, 2025	Jan. 31, 2024	Dec. 20, 2024	Nov. 16, 2022
Proceeds from Issuance of Common Stock		$ 135,289	$ 131,162
Proceeds from Warrant Exercises		$ 3,300	740
Advances From Future Warrant Exercise			$ 520
Shelf 2022 [Member]
Stock Offering, Maximum Amount					$ 300,000
November 2022 At-the-market Offering [Member]
Stock Offering, Maximum Amount					$ 300,000
Stock Issued During Period, Shares, New Issues (in shares)		11,516,375	21,188,029
Proceeds from Issuance of Common Stock		$ 94,400	$ 132,490
Payments of Stock Issuance Costs		$ 2,150	$ 2,980
December 2024 ATM Offering [Member]
Stock Offering, Maximum Amount				$ 300,000
Stock Issued During Period, Shares, New Issues (in shares)		5,310,281
Proceeds from Issuance of Common Stock		$ 40,520
Payments of Stock Issuance Costs		$ 910
December 2024 ATM Offering [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)	295,000
Proceeds from Issuance of Common Stock	$ 2,090
Payments of Stock Issuance Costs	$ 50