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Investments in and Advances to Partnerships - Investment Reconciliation (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Reconciliation of investments in partnerships    
Investments in partnerships at beginning of year $ 2,582,473  
Share of income from partnerships 58,521 49,669
Impairment loss (48,485)  
Investments in partnerships at end of year 2,592,509  
Local Partnerships [Member]
   
Reconciliation of investments in partnerships    
Share of income from partnerships   $ 49,669