Note 2 - Basis of Presentation, Principles of Consolidation, Significant Accounting Policies and Liquidity - Schedule of Fair Value Measurements, Recurring and Nonrecurring (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Warrant Liability Long Term [Member]
Balance	$ 2	$ 77
Change in fair value - net	(1)	(76)
Balance	1	1
Fair Value, Recurring [Member] | Warrant Liability [Member]
Fair value of warrant liability	1	1	$ 77
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	$ 1	$ 77