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Capital Notes (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2012
Jun. 30, 2012
Dec. 31, 2009
Jun. 30, 2011
Jun. 30, 2012
Capital Notes, 6%, Due 4/1/2012 [Member]
Dec. 31, 2011
Capital Notes, 6%, Due 4/1/2012 [Member]
Jun. 30, 2012
Capital Notes, 6%, Due 4/1/2017 [Member]
Dec. 31, 2011
Capital Notes, 6%, Due 4/1/2017 [Member]
Capital Notes [Line Items]                
Capital notes issued   $ 9,627,000 $ 7,000,000          
Debt instrument, interest rate, stated percentage     6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Interest payment on notes 105,000              
Debt instrument, maturity date         Apr. 01, 2012 Apr. 01, 2012 Apr. 01, 2017 Apr. 01, 2017
Debt instrument, maximum principal authorized for issuance   12,000,000            
Debt instrument, maximum principal offered at the Company's discretion   $ 10,000,000