11. Stock Option Plan (Summary Of Activity In Stock Option Plans) (Details) (USD $)	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012
Shares Held in Employee Stock Ownership Plan [Abstract]
Outstanding Options, Beginning Balance	249,700	317,180
Outstanding Options, Granted
Outstanding Options, Exercised	(12,000)
Outstanding Options, Forfeited	(1,750)
Outstanding Options, Expired	(39,700)	(22,800)
Outstanding Options, Ending Balance	196,250	294,380
Outstanding, Weighted-Average Exercise Price, Beginning Balance	$ 18.98	$ 18.17
Outstanding, Weighted-Average Exercise Price, Granted
Outstanding, Weighted-Average Exercise Price, Exercised	$ 5.09
Outstanding, Weighted-Average Exercise Price, Forfeited	$ 19.69
Outstanding, Weighted-Average Exercise Price, Expired	$ 23.41	$ 5.12
Outstanding, Weighted-Average Exercise Price, Ending Balance	$ 18.92	$ 19.18

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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)(iv)(4)

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

+ References

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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