Note 4 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2023

	Three Months Ended March 31, 2023
	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value
Outstanding, January 1, 2023		702,805		$	4.42		5.5	$	—
Granted		1,339,500			0.32
Cancelled/Forfeited		(138,350	)		1.04
Expired		(850	)		61.60
Outstanding, March 31, 2023		1,903,105		$	1.75		8.2	$	—
Exercisable, March 31, 2023		569,231		$	4.92		4.5	$	—

	Three Months Ended March 31, 2023
	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested, January 1, 2023		90,000	$	0.99
Vested		—		—
Unvested, March 31, 2023		90,000	$	0.99