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Fair Value Disclosures (Details 1) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Assets and liabilities for which a nonrecurring change in fair value was recorded:    
$- $ 216,488,896 $ 218,911,770
Fair Value, Measurements, Nonrecurring
   
Assets and liabilities for which a nonrecurring change in fair value was recorded:    
$-   6,105,176
-   508,529
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Assets and liabilities for which a nonrecurring change in fair value was recorded:    
$-     
-     
Fair Value, Measurements, Nonrecurring | Significant Other Unobservable Inputs (Level 3)
   
Assets and liabilities for which a nonrecurring change in fair value was recorded:    
$- 2,269,351 2,322,847
-     
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)
   
Assets and liabilities for which a nonrecurring change in fair value was recorded:    
$-   3,782,329
-   $ 508,529