Accounting for Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2022

Share-Based Payment Arrangement [Abstract]

Schedule of stock option activities

	September 30, 2022
	Number of Options			Weighted-Average Exercise Price
Outstanding at beginning of year		617,273		$	6.47
Granted		233,500			3.71
Exercised		(96,000	)		0.68
Forfeited		(150,834	)		7.88
Expired		(22,666	)		9.26
Outstanding at September 30, 2022		581,273		$	6.23
Options exercisable at September 30, 2022		278,271		$	4.25

Valuation assumptions for stock-based compensation

	For Three Months Ended September 30, 2022		For Three Months Ended September 30, 2021		For Nine Months Ended September 30, 2022		For Nine Months Ended September 30, 2021
Weighted average grant date fair value	$	3.58	$	–	$	3.41	$	8.99
Weighted average assumptions used:
Expected dividend yield		0.0%		–		0.0%		0.0%
Risk-free interest rate		2.81%		–		1.43%		0.80%
Expected volatility		132.2%		–		132.7%		81.81%
Expected life (in years)		6.9		–		6.7		5.0