Note 9 - Stock Options (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block]

	Number of Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)
Outstanding EVTDS at December 31, 2020		-
Options acquired in Merger		649,643		$	5.80		4.61
Exercised		(287,536	)	$	2.40
Cancelled/Forfeited at $2.40 Exercise Price		(3,357	)	$	2.40
Cancelled/Forfeited at $9.00 Exercise Price		(10,500	)	$	9.00
Cancelled/Forfeited at $26.20 Exercise Price		(9,750	)	$	26.20
Subtotal, as follows:		338,500
Outstanding options at $2.40 Exercise Price		50,000		$	2.40
Outstanding options at at $9.00 Exercise Price		281,750		$	9.00
Outstanding options at $26.20 Exercise Price		6,750		$	26.20
Outstanding at December 31, 2021		338,500		$	8.40		6.98
Options Granted during 2022:
Options Granted at $2.00 Exercise Price		250,000		$	2.00
Options Granted at $2.40 Exercise Price		90,893		$	2.40
Options Granted at $3.62 Exercise Price		2,762		$	3.62
Options Granted at $9.00 Exercise Price		1,111		$	9.00
Exercised		(50,000	)	$	2.40
Canceled/Forfeited		(25,000	)	$	9.00
Subtotal, as follows:		608,266
Outstanding Options at $2.00 Exercise Price		250,000		$	2.00		9.05
Outstanding Options at $2.40 Exercise Price		90,893		$	2.40		9.05
Outstanding Options at $3.62 Exercise Price		2,762		$	3.62		4.09
Outstanding Options at $9.00 Exercise Price		257,861		$	9.00		7.96
Outstanding Options at $26.20 Exercise Price		6,750		$	9.00		5.30
Outstanding at December 31, 2022		608,266		$	5.30		8.52
Exercisable at December 31, 2022		605,101		$	5.30		8.54

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

	2022
Risk-free interest rate		1.76	%
Expected volatility		146.3	%
Expected option term (years)		9.7
Expected dividend yield		0	%