Stock Option Plans and Agreements (Tables)

3 Months Ended

Mar. 31, 2023

Stock Option Plans and Agreements

Stock option valuation assumptions

Risk-free interest rate	3.57% - 3.98%
Expected dividend yield		0	%
Expected stock price volatility		110	%
Expected life of options (years)		2.75

Stock option activity

	Number of			Weighted		Remaining	Aggregate
	Options			Average		Contractual	Intrinsic
	Outstanding			Exercise Price		Term	Value
Outstanding at December 31, 2022		131,789		$	6.03
Granted		47,600			1.20
Expired		(5,334	)		3.00
Outstanding at March 31, 2023		174,055		$	4.82	3.1 years	$	0
At March 31, 2023- vested or
expected to vest		158,921		$	5.16	2.9 years	$	0
Exercisable		158,921		$	5.16	2.9 years	$	0