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Earnings Per Share (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Earnings Per Share [Abstract]
Common Stock, Dividend Rate, Percentage		10.00%		10.00%
Denominator for basic earnings per share, weighted average shares	3,626,000		3,606,000	3,624,000	3,607,000
Effect of dilutive securities, employee stock options	12,000		9,000	13,000	5,000
Denominator for diluted earnings per share, adjusted weighted average shares and assumed conversions	3,638,000		3,615,000	3,637,000	3,612,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				0	66,000
Share Price	$ 28.95		$ 27.45	$ 28.95	$ 27.45	$ 27.05

X

- Definition

The percentage rate used to calculate dividend payments on common stock.

+ References

No definition available.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

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- Definition

Price of a single share of a number of saleable stocks of a company.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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