Note 13 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]

	Level 1		Level 2		Level 3		Total
Total liabilities at fair value as of March 31, 2022 - Derivative warrant liability	$	-	$	-	$	429	$	429
Total liabilities at fair value as of December 31, 2021 - Derivative warrant liability	$	-	$	-	$	258	$	258

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

	Fair Value as of Beginning of Period		Total Realized and Unrealized Gains (Losses)			Issuance of New Instruments		Net Transfers (Into) Out of Level 3		Fair Value, at End of Period		Change in Unrealized Gains (Losses) on Instruments Still Held
Total Level 3 fair value - Derivative warrant liability	$	258	$	(171	)	$	-	$	-	$	429	$	(171	)

Warrants, Valuation Assumption [Table Text Block]

	March 31, 2022			December 31, 2021
Assumed volatility		75.1	%		69.5	%
Assumed risk free interest rate		1.7	%		0.8	%
Expected life of options (in years)		4.5			4.8
Expected dividends		-			-