Note 16 - Warrants (Details Textual) $ / shares in Units, $ in Millions					12 Months Ended
	Jun. 14, 2024 USD ($) $ / shares shares	Jun. 08, 2023 USD ($) $ / shares shares	Jan. 06, 2023	Mar. 07, 2022 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) shares		Jun. 30, 2023 $ / shares shares		Dec. 31, 2022 $ / shares	Oct. 25, 2022 $ / shares	Aug. 11, 2022 $ / shares shares	Jan. 26, 2022 USD ($) $ / shares
Proceeds from Warrant Exercises | $					$ 3.5
Class of Warrant or Right, Outstanding (in shares)					6,075,880	[1]	6,538,052	[2]
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio			20
Pre-Funded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		430,217
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 0.0001									$ 0.02
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)		1
Tranche A Common Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		2,173,912
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 3.18
Warrants and Rights Outstanding, Term (Year)		5 years
Tranche B Common Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		2,173,912			1,806,434
Proceeds from Warrant Exercises | $	$ 3.5
Stock Issued During Period, Shares, Warrants Exercised (in shares)	367,478
Common Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 1.59
Common Warrants Exchanged for PreFunded Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 1.5899
Tranche B Pre-Funded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	1,806,434				1,806,434
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 0.0001
Warrants and Rights Outstanding | $	$ 5.1
August 2022 Prefunded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)											87,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares											$ 0.02
August 2022 Common Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)											1,265,547
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares							$ 2.32		$ 3.3		$ 8.6
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)											1
Warrants and Rights Outstanding, Term (Year)											5 years
August 2022 Common Warrants [Member] | Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares											$ 2.32
August 2022 Common Warrants [Member] | Maximum [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)											2,325,581
March 2022 Prefunded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				151,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 0.002
March 2022 Common Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				333,300
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 26
March 2022 Common and Prefunded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)				1.1
Warrants and Rights Outstanding, Term (Year)				5 years
Payment of Financing and Stock Issuance Costs | $				$ 2.8
Avenue Capital Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares				$ 24.2						$ 8.6		$ 24.2
Warrants and Rights Outstanding | $												$ 0.6
Liability Warrants [Member]
Class of Warrant or Right, Outstanding (in shares)					3,821,115		6,068,763
Liability Pre-Funded Warrants [Member]
Class of Warrant or Right, Outstanding (in shares)					430,217		430,217
Equity Warrants [Member]
Class of Warrant or Right, Outstanding (in shares)					18,114		39,072
Liability Tranche B Prefunded Warrants [Member]
Class of Warrant or Right, Outstanding (in shares)					1,806,434
Securities Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)		1,743,695
Proceeds from Issuance or Sale of Equity | $		$ 4.0
Payment of Financing and Stock Issuance Costs | $		3.4
Securities Purchase Agreement Warrants [Member]
Warrants and Rights Outstanding | $		5.0
Payments of Stock Issuance Costs | $		$ 0.6
The March 2022 Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)				151,500
Proceeds from Issuance or Sale of Equity | $				$ 7.6
Payment of Financing and Stock Issuance Costs | $				$ 0.8

[1] The number of warrants outstanding as of June 30, 2024, is comprised of 3,821,115 liability classified warrants, 430,217 liability classified June 2023 Pre-Funded Warrants, 1,806,434 liability classified Tranche B Pre-Funded Warrants and 18,114 equity classified warrants.

[2] The number of warrants outstanding as of June 30, 2023, is comprised of 6,068,763 liability classified warrants, 430,217 liability classified June 2023 Pre-Funded Warrants and 39,072 equity classified warrants.