Note 13 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

	Level 1		Level 2		Level 3		Total
As of December 31, 2022:
Derivative warrant liability	$	-	$	-	$	69	$	69
Total liabilities at fair value	$	-	$	-	$	69	$	69
As of December 31, 2021:
Derivative warrant liability	$	-	$	-	$	258	$	258
Total liabilities at fair value	$	-	$	-	$	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
2022:
Derivative warrant liability	$	258	$	(189	)	$	-	$	-	$	69	$	(189	)
Total Level 3 fair value	$	258	$	(189	)	$	-	$	-	$	69	$	(189	)
2021:
Derivative warrant liability	$	-	$	-		$	647	$	-	$	258	$	(389	)
Total Level 3 fair value	$	-	$	-		$	647	$	-	$	258	$	(389	)

Warrants, Valuation Assumption [Table Text Block]

	December 31, 2022			December 31, 2021			September 30, 2021
Assumed exercise price, per share	$	2.72		$	10.00		$	10.00
Assumed volatility		92.2	%		69.5	%		71.0	%
Assumed risk free interest rate		4.3	%		0.8	%		0.4	%
Expected life of options (in years)		4.0			4.8			5.0
Expected dividends		-			-			-