Note 14 - The Financing and Warrant Liabilities - Warrant Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Warrants	$ 0	$ 84	$ 0	$ 185
Change in Fair Value (Gain)/Loss	(0)	(101)
Investor Warrants Issued in Connection with 2021 Financing [Member]
Warrants	0	49	0	86
Change in Fair Value (Gain)/Loss	0	(37)
Placement Agent Warrants Issued in Connection with 2021 Financing [Member]
Warrants	0	5	0	9
Change in Fair Value (Gain)/Loss	0	(4)
Investor Warrants Issued in Connection with 2020 Financing [Member]
Warrants	0	25	0	76
Change in Fair Value (Gain)/Loss	0	(51)
Placement Agent Warrants Issued in Connection with 2020 Financing [Member]
Warrants	0	5	$ 0	$ 14
Change in Fair Value (Gain)/Loss	$ 0	$ (9)