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Compensation Plan for Outside Directors (Details) (Restricted Shares Award [Member], USD $) | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011
Restricted Shares Award [Member] |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |
Compensation expense | $ 151,025 | $ 129,135

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