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

3 Months Ended

Mar. 31, 2022

Notes Tables

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

		March 31, 2022				December 31, 2021
Vendor prepayments and deposits		$	557			$	486
Prepaid sponsored research			329				474
Prepaid insurance			243				589
Related party receivables			22				22
Non-trade receivables			5				23
Total prepaid expenses and other current assets		$	1,156			$	1,594

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 March 31, 2022:		$	1,252			$	—			$	—			$	1,252
Fair value of warrant liability as of December 31, 2021:		$	1,412			$	—			$	—			$	1,412

Three Months Ended March 31, 2022		*Warrant Liability Long-Term*				*Warrant Liability Total*
Balance, December 31, 2021		$	1,412			$	1,412
Change in fair value - net			(160	)			(160	)
Balance, March 31, 2022		$	1,252			$	1,252

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

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