Note 4 - Summary of Significant Accounting Policies - Summary of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Warrant liabilities	$ 0	$ 185
Fair Value, Recurring [Member]
Warrant liabilities	0	185
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Warrant liabilities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Warrant liabilities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Warrant liabilities	$ 0	$ 185