Note 11 - Capital Stock (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	Mar. 08, 2024	Jan. 31, 2024	Jan. 31, 2024	Nov. 16, 2022	Nov. 26, 2021	May 17, 2021	May 14, 2021
Proceeds from Warrant Exercises		$ 737	$ 737
Advances From Future Warrant Exercise		$ 517	$ 517
Class of Warrant or Right Exercised (in shares)			302,220
Subsequent Event [Member]
Proceeds from Warrant Exercises	$ 3,262
Class of Warrant or Right Exercised (in shares)	994,702
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
At-the-market Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)		10,418,029	21,188,029
Proceeds from Issuance of Common Stock, Net		$ 73,238	$ 129,508
At-the-market Offering [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)	1,700,000
Proceeds from Issuance of Common Stock, Net	$ 13,390