Note 11 - Capital Stock (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Dec. 04, 2024	Oct. 31, 2024	Oct. 31, 2023	Nov. 16, 2022
Proceeds from Issuance of Common Stock		$ 64,647	$ 56,534
Proceeds from Warrant Exercises		$ 3,390	$ 0
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)		7,595,626	10,770,000
Proceeds from Issuance of Common Stock		$ 62,640	$ 57,570
Payments of Stock Issuance Costs		$ 1,410	$ 1,300
November 2022 At-the-market Offering [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)	3,920,749
Proceeds from Issuance of Common Stock	$ 31,760
Payments of Stock Issuance Costs	$ 710