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Note 6 - Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2024

Notes Tables

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

Risk-Free interest rate			3.93% - 4.61%
Expected dividend yield			—%
Expected stock price volatility			63.31%
Expected life of options (in years)			5.50-6.25

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)			812,600				1.60
Exercised			(30,000	)			1.36
Expired (2)			(358,500	)			2.10
Canceled (3)			(63,125	)			1.59
Outstanding at June 30, 2024			5,830,222			$	2.96				5.83			$	138,360
Exercisable at June 30, 2024			4,430,623			$	3.20				4.89			$	109,383

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 June 30, 2024			117,925			$	1.59

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

		Three Months Ended June 30,								Six Months Ended June 30,
		2024				2023				2024				2023
General and administrative		$	285,372			$	323,796			$	579,406			$	643,132
Research and development			12,231				10,520				24,675				21,823
Total		$	297,603			$	334,316			$	604,081			$	664,955

		Three Months Ended June 30,								Six Months Ended June 30,
		2024				2023				2024				2023
Share based compensation expense - stock option		$	243,538			$	278,373			$	433,807			$	554,914
Share based compensation expense - restricted stock units			54,065				55,943				170,274				110,041
Total		$	297,603			$	334,316			$	604,081			$	664,955

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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