Note 2 - Basis of Presentation, Principles of Consolidation, and Significant Accounting Policies and Liquidity (Tables)

6 Months Ended

Jun. 30, 2024

Notes Tables

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]

	June 30, 2024		December 31, 2023
Prepaid sponsored research	$	1,277	$	1,515
Prepaid insurance		1,143		564
Vendor prepayments and deposits		457		545
Non-trade receivables		5		95
Related party receivables		4		4
Total prepaid expenses and other current assets	$	2,886	$	2,723

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

Description	Fair Value		Level 1		Level 2		Level 3
Fair value of warrant liability as of June 30, 2024:	$	1,704	$	—	$	—	$	1,704
Fair value of warrant liability as of December 31, 2023:	$	4,855	$	—	$	—	$	4,855

Three Months Ended June 30, 2024	Warrant Liability Long-Term
Balance, March 31, 2024	$	3,400
Change in fair value - net		(1,696	)
Balance, June 30, 2024	$	1,704

Six Months Ended June 30, 2024	Warrant Liability Long-Term
Balance, December 31, 2023	$	4,855
Change in fair value - net		(3,151	)
Balance, June 30, 2024	$	1,704