At the Annual Meeting of Stockholders held April 26, 2017, the stockholders approved the 2017 Stock Incentive Plan ("SI Plan"). The SI Plan was implemented to succeed the Company's 2007 Stock Incentive Plan, which had a ten-year term. The SI Plan is intended to provide a means whereby directors, employees, consultants and advisors of the Company and its Subsidiaries may sustain a sense of proprietorship and personal involvement in the continued development and financial success of the Company and its Subsidiaries, thereby advancing the interests of the Company and its stockholders. Accordingly, directors and selected employees, consultants and advisors may be provided the opportunity to acquire shares of Common Stock of the Company on the terms and conditions established in the SI Plan.

A maximum of 149,983 shares are authorized under the SI Plan. There have been no options awarded since 2008. All previously issued, unexercised options expired on December 16, 2018. The Company awarded 25,950, 26,700 and 28,700 shares (under the 2017 Stock Incentive Plan) during 2020, 2019, 2018, respectively as stock and stock unit awards.

The following table summarizes the compensation cost, net of forfeitures, related to stock-based compensation for the years ended December 31, 2020, 2019 and 2018 (in thousands):

	2020			2019			2018
Stock and stock unit awards:
Pre-tax compensation expense	$	774		$	453		$	314
Income tax benefit		(163	)		(95	)		(66	)
Total share-based compensation expense, net of income taxes	$	611		$	358		$	248

A summary of option activity under the 1997 Stock Incentive Plan as of December 31, 2018, and changes during the years then ended is presented below:

	2018
						Weighted-
				Weighted-		Average		Aggregate
				Average		Remaining		Intrinsic
	Shares			Exercise Price		Contractual Term		Value
Outstanding, beginning of year		10,500		$	23.00
Granted		0			0.00
Exercised		(10,500	)		23.00
Forfeited or expired		0			0.00
Outstanding, end of year		0		$	0.00		0.00	$	—
Exercisable, end of year		0		$	0.00		0.00	$	—

The total intrinsic value of options exercised during 2018 was $176,000. There were no stock options for shares of common stock not considered in computing the aggregate intrinsic value of outstanding shares and exercisable shares for 2018 because they were anti-dilutive. There were no stock options remaining after 2018.

The following table summarizes non-vested stock and stock unit activity for the years ended December 31, 2020, 2019 and 2018:

	2020						2019					2018
				Weighted-avg						Weighted-avg					Weighted-avg
				Grant-date						Grant-date					Grant-date
	Shares			Fair Value			Shares			Fair Value		Shares			Fair Value
Nonvested, beginning of year		37,908		$	35.49			24,280		$	38.92		0		$	0.00
Granted		25,950			34.46			26,700			33.31		28,700			38.92
Vested		(21,305	)		35.99			(13,072	)		37.42		(4,420	)		38.92
Forfeited		(333	)		(33.31	)		0			0.00		0			0.00
Nonvested, end of year		42,220		$	34.62			37,908		$	35.49		24,280		$	38.92
Fair value of shares vested				$	766,774					$	489,110				$	172,026

The fair value of the awards is amortized to compensation expense over the vesting periods of the awards (four years for restricted stock unit awards and three years for restricted stock awards) and is based on the market price of the Company’s common stock at the date of grant multiplied by the number of shares granted that are expected to vest. As of December 31, 2020, 2019 and 2018, there was $1,156,000, $1,053,000, and $795,000, respectively, of total unrecognized compensation cost related to unvested stock and stock unit awards under the SI Plan.