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Note 6 - Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

		Years Ended December 31,
		2021				2020
Risk-free interest rate			0.05% - 1.24%				0.25% - 1.72%
Expected dividend yield			—%				—%
Expected stock price volatility			54.52% - 60.80%				39.94% - 51.22%
Expected life of options		0.5 - 6.25 Years				1.75 - 6.25 Years

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

										Weighted-
										Average
						Weighted-				Remaining				Aggregate
						Average				Contractual				Intrinsic
		Shares				Exercise Price				Term (Years)				Value
Outstanding at December 31, 2019			3,860,390			$	1.76				5.69			$	13,287,932
Granted			913,000				5.24
Exercised			(135,000	)			1.89
Expired			—				—
Canceled			—				—
Outstanding at December 31, 2020			4,638,390			$	2.44				5.64			$	13,701,610
Granted (1)			870,825				5.11
Exercised (2)			(735,000	)			1.67
Expired			—				—
Canceled			—				—
Outstanding at December 31, 2021			4,774,215			$	3.04				6.14			$	8,413,444
Exercisable at December 31, 2021			3,384,516			$	2.45				5.21			$	7,674,636

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

		Years Ended December 31,
		2021				2020
General and administrative		$	1,571,328			$	1,466,461
Research and development			212,774				185,432
Total		$	1,784,102			$	1,651,893

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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