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Note 4 - Equity (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

		Number of				Weighted Average
		Warrants				Exercise Price
Outstanding at January 1, 2021			2,154,747			$	4.37
Issued			50,000				5.29
Outstanding at December 31, 2021			2,204,747			$	4.39
Issued			100,000				1.44
Cancelled or expired			(112,993	)			4.47
Exercised			(13,643	)			0.50
Outstanding at September 30, 2022			2,178,111			$	4.28
Vested or expected to vest at September 30, 2022			25,002				3.02
Exercisable at September 30, 2022			1,869,778			$	4.63

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Expected term (in years):			10
Risk-free rate:			0.07% – 3.26%
Volatility:			75.98% – 88.38%
Dividend yield:			0%

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

		Number of				Weighted Average
		Shares				Exercise Price
Outstanding at January 1, 2021			6,844,069			$	2.81
Options granted			2,519,628				4.26
Options exercised			(670,889	)			1.01
Options expired			(118,507	)			3.00
Outstanding at December 31, 2021			8,574,301			$	3.35
Options granted			2,901,166				2.18
Options exercised			(116,973	)			0.02
Options expired or cancelled			(66,667	)			2.55
Outstanding at September 30, 2022			11,291,827			$	3.09
Vested or expected to vest at September 30, 2022			578,807				2.94
Exercisable at September 30, 2022			6,579,287			$	3.23

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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