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Note 13 - Warrant Liability (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedule of Derivative Instruments [Table Text Block]

Assumptions		2019 Domestic Warrants				2019 Foreign Warrants
Expected price volatility			178	%			178	%
Expected term (in years)			4.57				4.57
Risk-free interest rate			0.25	%			0.27	%
Dividend yield			0.00	%			0.00	%
Weighted-average fair value of warrant		$	1.18			$	1.54

Expected price volatility			186	%
Expected term (in years)			4.05
Risk-free interest rate			0.22	%
Dividend yield			0.00	%
Weighted-average fair value of warrants		$	1.17

Expected price volatility			84.9	%
Expected term (in years)			6.2
Risk-free interest rate			1.29	%
Dividend yield			0.00	%
Weighted-average fair value of warrants		$	0.38

Expected price volatility			87	%
Expected term (in years)			6.0
Risk-free interest rate			1.31	%
Dividend yield			0.00	%
Weighted-average fair value of warrants		$	0.25

X

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

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