Note 14 - Capital Structure (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			9 Months Ended		12 Months Ended
	Jun. 08, 2023	Aug. 11, 2022	Mar. 31, 2024	Mar. 31, 2023	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Sep. 28, 2021	Jun. 04, 2021	Jun. 08, 2020
Common Stock, Shares Authorized (in shares)			200,000,000		200,000,000	200,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.0001		$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized (in shares)			50,000,000		50,000,000	50,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.0001		$ 0.0001	$ 0.0001
Common Stock, Shares, Outstanding (in shares)			5,567,909		5,517,174
Proceeds from Issuance or Sale of Equity			$ 86	$ 13,012
Payments of Stock Issuance Costs			$ 160	$ 1,045
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)		$ 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, Number of Securities Called by Each Warrant or Right (in shares)		1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 8.6			$ 2.32		$ 3.3
Warrants and Rights Outstanding, Term (Year)		5 years
August 2022 Common and Prefunded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)		1
Sale of Stock, Price Per Share (in dollars per share)		$ 8.58
Warrants and Rights Outstanding, Term (Year)		5 years
Warrants and Rights Outstanding		$ 6,000
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, Number of Securities Called by Each Warrant or Right (in shares)	1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.0001
Tranche A Common Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	2,173,912
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
Common Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 1.59
Common Warrants Exchanged for PreFunded Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	1.5899
Tranche A Common Warrants at Double Exercise Price [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 3.18
Securities Purchase Agreement Warrants [Member]
Warrants and Rights Outstanding	$ 5,000
Payments of Stock Issuance Costs	$ 600
The 2020 Shelf [Member]
Sale of Stock, Maximum Amount of Equity Issuable										$ 100,000
At-the-market Offering [Member]
Sale of Stock, Maximum Amount of Equity Issuable									$ 30,000
Stock Issued During Period, Shares, New Issues (in shares)					699,929
Proceeds from Issuance or Sale of Equity					$ 2,900
The 2021 Shelf [Member]
Sale of Stock, Maximum Amount of Equity Issuable								$ 100,000
Sale of Stock, Remaining Amount Available						$ 82,400
The August 2022 Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)		1,075,290
Proceeds from Issuance or Sale of Equity		$ 10,000
Sale of Stock, Price Per Share (in dollars per share)		$ 8.6
Payment of Financing and Stock Issuance Costs		$ 900
Securities Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	1,743,695
Proceeds from Issuance or Sale of Equity	$ 4,000
Payment of Financing and Stock Issuance Costs	3,400
Class of Warrant or Right, Covenant, Adjusted EBITDA	$ 12,000
Restricted Stock [Member]
Common Stock, Shares, Outstanding (in shares)			31,897