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Note 12 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

				2021						2020
Risk-free interest rate			0.46	-	1.26%				0.26	-	0.39%
Dividend yield				0%						0%
Expected term (years)			2.5	-	5					5
Expected volatility			46.0	-	92.0%				65.8	-	90.3%

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

Options outstanding
						Weighted average			Weighted average		Aggregate
						exercise price			remaining		intrinsic
		Shares				per share			contractual term		value
Outstanding at December 31, 2019			1,349,000			$	0.23
Options granted			235,000				0.64
Options exercised			(50,000	)			0.20
Options expired			(99,000	)			0.18
Options forfeited			(40,000	)			0.16
Outstanding at December 31, 2020			1,395,000				0.31		4 years, 5 months		$	1,591,223
Options granted			1,982,500				4.48
Options exercised			(453,000	)			0.21
Options expired			(20,000	)			0.17
Options forfeited			-
Outstanding at December 31, 2021			2,904,500			$	3.17		4 years, 11 months		$	5,159,253
Exercisable at December 31, 2021			1,952,000			$	2.73		4 years, 7 months		$	4,326,073

Schedule of Nonvested Share Activity [Table Text Block]

		Nonvested
						Weighted average
						grant date
		Shares				fair value
Nonvested at December 31, 2019			23,500			$	0.17
Granted			235,000				0.36
Vested			(23,500	)			0.17
Forfeited			-				-
Nonvested at December 31, 2020			235,000			$	0.36
Granted			1,982,500				1.55
Vested			(1,265,000	)			1.35
Forfeited			-				-
Nonvested at December 31, 2021			952,500			$	1.51

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- Definition

Tabular disclosure of the changes in outstanding nonvested shares.

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