Note 2 - Basis of Presentation, Principles of Consolidation, and Significant Accounting Policies and Liquidity - Schedule of Fair Value Measurements, Recurring and Nonrecurring (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Warrant Liability Long Term [Member]
Balance	$ 3,400	$ 4,855
Change in fair value - net	(1,696)	(3,151)
Balance	1,704	1,704
Fair Value, Recurring [Member] | Warrant Liability [Member]
Fair value of warrant liability	1,704	1,704	$ 4,855
Fair Value, Recurring [Member] | Warrant Liability [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of warrant liability	0	0	0
Fair Value, Recurring [Member] | Warrant Liability [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of warrant liability	0	0	0
Fair Value, Recurring [Member] | Warrant Liability [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of warrant liability	$ 1,704	$ 1,704	$ 4,855