Note 14 - The Financing and Warrant Liabilities- Fair Value of Warrants (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Warrant liabilities	$ 0	$ 0	$ 84	$ 185
Investor Warrants Issued in Connection with 2021 Financing [Member]
Warrant liabilities	0	0	49	86
Placement Agent Warrants Issued in Connection with 2021 Financing [Member]
Warrant liabilities	$ 0	$ 0	$ 5	$ 9
Measurement Input, Share Price [Member] | Investor Warrants Issued in Connection with 2021 Financing [Member]
Warrant, measurement input	1.02	0.83	1.7	0.46
Measurement Input, Share Price [Member] | Placement Agent Warrants Issued in Connection with 2021 Financing [Member]
Warrant, measurement input	1.02	0.83	1.7	0.46
Measurement Input, Expected Term [Member] | Investor Warrants Issued in Connection with 2021 Financing [Member]
Warrant, measurement input	0.4	0.6	1.38	1.63
Measurement Input, Expected Term [Member] | Placement Agent Warrants Issued in Connection with 2021 Financing [Member]
Warrant, measurement input	0.4	0.6	1.38	1.63
Measurement Input, Risk Free Interest Rate [Member] | Investor Warrants Issued in Connection with 2021 Financing [Member]
Warrant, measurement input	0.0539	0.0513	0.0444	0.04625
Measurement Input, Risk Free Interest Rate [Member] | Placement Agent Warrants Issued in Connection with 2021 Financing [Member]
Warrant, measurement input	0.0539	0.0513	0.0444	0.04625
Measurement Input, Expected Dividend Rate [Member] | Investor Warrants Issued in Connection with 2021 Financing [Member]
Warrant, measurement input	0	0	0	0
Measurement Input, Expected Dividend Rate [Member] | Placement Agent Warrants Issued in Connection with 2021 Financing [Member]
Warrant, measurement input	0	0	0	0
Measurement Input, Price Volatility [Member] | Investor Warrants Issued in Connection with 2021 Financing [Member]
Warrant, measurement input	1.11	0.82	1.13	0.9974
Measurement Input, Price Volatility [Member] | Placement Agent Warrants Issued in Connection with 2021 Financing [Member]
Warrant, measurement input	1.11	0.82	1.13	0.9974
Measurement Input, Exercise Price [Member] | Investor Warrants Issued in Connection with 2021 Financing [Member]
Warrant, measurement input	17.95	17.95	17.95	3.59
Measurement Input, Exercise Price [Member] | Placement Agent Warrants Issued in Connection with 2021 Financing [Member]
Warrant, measurement input	22.4375	22.4375	22.4375	4.4875
Measurement Input, Quoted Price [Member] | Investor Warrants Issued in Connection with 2021 Financing [Member]
Warrant, measurement input	0	0	0.0937	0.0329
Measurement Input, Quoted Price [Member] | Placement Agent Warrants Issued in Connection with 2021 Financing [Member]
Warrant, measurement input	0	0	0.0727	0.0256