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Stock Option Plans (Tables)

12 Months Ended

Dec. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Option Activity

		2016				2015
Options outstanding  at the
beginning of the year			1,267,802				1,357,813
Options granted			171,000				47,000
Options forfeited			(33,825	)			(39,375	)
Options exercised			(316,699	)			(97,636	)
Options outstanding at
the end of the year			1,088,278				1,267,802
Options exercisable at the
end of the year			769,403				970,017
Common stock available for future grants at the end of the year			66,850				201,350
Weighted average exercise price per share:
Granted		$	21.41			$	18.90
Forfeited			15.03				15.65
Exercised			10.99				12.79
Outstanding			14.18				12.46
Exercisable			12.29				11.72

Summary of Options Outstanding

		Options Outstanding			Options Exercisable
Range of Exercise Prices	Number Outstanding	Weighted- Average Remaining Contractual Life (Years)	Weighted- Average Exercise Price		Number Exercisable	Weighted- Average Exercise Price
$7.30 to $10.10	214,038	4	$                  9.49		214,038	$                9.49
$10.11 to $12.14	221,865	5	10.85		212,490	10.80
$12.15 to $14.68	218,000	5	13.49		182,000	13.44
$14.69 to $16.98	216,375	6	16.35		134,125	16.20
$16.99 to $21.49	218,000	9	20.84		26,750	19.09
	1,088,278				769,403

Assumptions Used to Value Option Grants

		2016				2015
Expected life in years			5				5
Interest rate			1.07 – 1.24%				1.33 – 1.62%
Volatility			.236-.258				.234-.252
Dividend yield			1.6% - 2.0%				1.95% - 2.10%

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- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Tabular disclosure of the number of fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both options (or share units) currently outstanding and options (or share units) exercisable (or convertible).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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