Stock Based Compensation (Details 1) (USD $)	6 Months Ended	12 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Status of the Corporation's stock option plans
Outstanding at beginning of period, Shares	587,342	463,642	463,642
Outstanding at beginning of period, Weighted-average exercise price	$ 4.68	$ 5.84	$ 5.84
Granted, Shares			161,538
Granted, Weighted-average exercise price		$ 2.14	$ 2.14
Forfeited, shares	(1,442)		(29,338)
Exercised, Shares
Exercised, Weighted-average exercise price
Forfeited, Weighted-average exercise price	$ 8.67		$ 7.03
Expired, shares			(8,500)
Expired, Weighted-average exercise price			$ 11.93
Outstanding at end of period, Shares	585,900		587,342
Outstanding at end of period, Weighted-average exercise price	$ 4.67		$ 4.68
Options exercisable at period end, Shares	399,033		317,467
Options exercisable at period end, Weighted-average exercise price	$ 5.76		$ 6.58
Weighted-average fair value of options granted during the period, Shares
Weighted-average fair value of options granted during the period			$ 1.49

Share based compensation arrangement by share based payment award options grants in period fair value number.

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- Definition

Weighted average fair value of options granted during period.

+ References

No definition available.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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- Definition

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

+ References

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- Definition

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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- Definition

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

+ References

No definition available.

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References

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- Definition

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

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- Definition

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

+ References

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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.

+ References

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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 price at which grantees can acquire the shares reserved for issuance on stock options awarded.

+ References

No definition available.

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

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