Note 16 - Capital Stock (Details Textual) - USD ($) $ in Thousands	2 Months Ended	12 Months Ended
	Sep. 28, 2023	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021	Nov. 16, 2022	Nov. 26, 2021	May 17, 2021	May 14, 2021
Proceeds from Warrant Exercises		$ 7,554	$ 3,589	$ 3,325
Shelf 2021 [Member]
Stock Offering, Maximum Amount						$ 200,000	$ 200,000
May 17, 2021 At-the-market Offering [Member]
Stock Offering, Maximum Amount							$ 100,000
May 14, 2021 At-the-market Offering [Member]
Stock Offering, Maximum Amount								$ 100,000
November 2021 At-the-market Offering [Member]
Stock Offering, Maximum Amount						$ 100,000
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)			15,934,606	15,171,253
Proceeds from Issuance of Common Stock, Net			$ 35,235	$ 58,420
November 2022 At-the-market Offering [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)	7,010,000
Proceeds from Issuance of Common Stock, Net	$ 36,217