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Independent Directors' Stock Option (Details) (Independent director's stock option plan, USD $)
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6 Months Ended | |||||
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Jun. 30, 2012
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Dec. 31, 2009
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Dec. 31, 2008
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Dec. 31, 2007
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Dec. 31, 2006
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Dec. 31, 2005
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Independent director's stock option plan
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
| Stock options granted, expected term | 10 years | |||||
| Stock options granted, excercise price | $ 9.10 | $ 9.10 | $ 9.10 | $ 9.15 | $ 9.15 | |
| Stock options, exercise price of future options | 100.00% | |||||
| Stock options, shares to purchase | 50,000 | |||||
| Stock options, outstanding | 45,000 | |||||
| Stock options, wieghted average contractual remaining life | 5 years | |||||
| Stock options granted, weighted average exercise price | $ 9.12 | |||||
| Number of shares authorized | 1,000,000 | |||||
| Number of shares reserved for issuance under the IDSOP | 1,000,000 |