Note 4 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2022

	Six Months Ended June 30, 2022
	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value
Outstanding, January 1, 2022		919,790		$	5.67		6.5	$	—
Granted		12,500			0.83
Cancelled/Forfeited		(152,455	)		2.38
Expired		(53,755	)		29.32
Outstanding, June 30, 2022		726,080		$	4.52		6.0	$	—
Exercisable, June 30, 2022		545,665		$	5.52		4.9	$	—

	Six Months Ended June 30, 2022
	Number of Shares			Weighted Average Grant-Date Fair Value
Unvested, January 1, 2022		95,000		$	1.40
Vested		(5,000	)		1.96
Unvested, June 30, 2022		90,000		$	1.37