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Note 5 - Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

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

Risk-Free interest rate			0.13%-0.55%
Expected dividend yield			—%
Expected stock price volatility			54.52%-56.07%
Expected life of options (in years)			2.00-6.25

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, 2020			4,638,390			$	2.44				5.64			$	13,701,610
Granted (1)			745,825				5.25
Exercised (2)			(60,000	)			1.93
Expired			—				—
Canceled			—				—
Outstanding at March 31, 2021			5,324,215			$	2.84				6.03			$	14,209,431
Exercisable at March 31, 2021			4,016,141			$	2.28				5.09			$	12,927,908

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

		Three Months Ended March 31,
		2021				2020
General and administrative		$	377,052			$	380,251
Research and development			44,019				46,688
Total		$	421,071			$	426,939

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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