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Note 6 - Share-based Compensation (Tables)

9 Months Ended

Sep. 30, 2024

Notes Tables

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

Risk-Free interest rate			3.56% - 4.61%
Expected dividend yield			—%
Expected stock price volatility			63.02-63.64%
Expected life of options (in years)			2.63-6.25

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

										Weighted-Average
						Weighted-Average				Remaining Contractual				Aggregate Intrinsic
		Shares				Exercise Price				Term (Years)				Value
Outstanding at December 31, 2023			5,469,247			$	3.08				5.66			$	322,738
Granted (1)			837,600				1.31
Exercised			(30,000	)			1.36
Expired (2)			(358,500	)			2.10
Canceled (3)			(73,312	)			1.73
Outstanding at September 30, 2024			5,845,035			$	2.96				5.57			$	3,500
Exercisable at September 30, 2024			4,458,123			$	3.19				4.63			$	3,500

Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

						Weighted-Average
						Grant Date
		Shares				Fair Value
Outstanding at December 31, 2023			213,044			$	1.43
Granted (1)			354,219				1.60
Vested (2)			(437,546	)			1.52
Unvested shares forfeited(3)			(11,792	)			1.59
Outstanding at September 30, 2024			117,925			$	1.59

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

		Three Months Ended September 30,								Nine Months Ended September 30,
		2024				2023				2024				2023
General and administrative		$	235,024			$	270,672			$	814,430			$	913,804
Research and development			12,366				10,635				37,041				32,458
Total		$	247,390			$	281,307			$	851,471			$	946,262

		Three Months Ended September 30,								Nine Months Ended September 30,
		2024				2023				2024				2023
Share based compensation expense - stock option		$	200,387			$	224,749			$	634,194			$	779,663
Share based compensation expense - restricted stock units			47,003				56,558				217,277				166,599
Total		$	247,390			$	281,307			$	851,471			$	946,262

X

- Definition

Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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