During the three months ended March 31, 2021, the Company recognized $545,000 of compensation expense associated with stock option and restricted stock awards granted in years 2015 through 2020. During the three months ended March 31, 2020, the Company recognized $351,000 of compensation expense associated with stock option and restricted stock awards granted in years 2016 through 2019.

During the first quarter of 2021, the Company’s Board of Directors approved extending the expiration date of stock options granted in years 2015 and 2016. The original expiration date of the stock options granted in 2015 was August 25, 2021, and was extended by two years to August 25, 2023. The original expiration date of the stock options granted in 2016 was August 25, 2022, and was extended by one year to August 25, 2023. The Company recorded an additional $232,000 of compensation expense during the quarter due to the exercise periods of these options being extended.

The following table summarizes the Company’s stock option activity for the three-month period ended March 31, 2021:


				Weighted
		Weighted		Average
		Average		Remaining	Aggregate
		Exercise		Contractual	Intrinsic
	Shares	Price		Term (Years)	Value*
Outstanding at December 31, 2020	1,125,383	$	25.62
Granted	—		—
Exercised	—		—
Forfeited or expired	—		—
Outstanding at March 31, 2021	1,125,383	$	25.62	5.2	$	685,000
Exercisable at March 31, 2021	640,512	$	26.77	2.8	$	—

* The aggregate intrinsic value of outstanding and exercisable stock options is defined as the difference between the market value of the Company's stock on March 31, 2021 of $21.63 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options.

The following table summarizes the Company’s restricted stock award activity for the three-month period ended March 31, 2021:


				Weighted
		Weighted		Average
	Shares of	Average		Remaining	Aggregate
	Restricted	Grant Date		Contractual	Intrinsic
	Stock	Fair Value		Term (Years)	Value*
Non-vested at December 31, 2020	72,490	$	23.77
Issued	—		—
Vested	(150)		28.77
Forfeited	—		—
Non-vested at March 31, 2021	72,340	$	23.76	2.5	$	1,565,000

*The aggregate intrinsic value of non-vested restricted stock was calculated using the market value of the Company’s stock on March 31, 2021 of $21.63 multiplied by the number of non-vested restricted shares outstanding.