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Segment Reporting Segment Reporting (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Revenues [Abstract]      
Total revenues $ 16,040,388 $ 14,919,859  
Interest Expense [Abstract]      
Interest expense 5,442,253 4,770,135  
Depreciation [Abstract]      
Depreciation expense 1,355,231 1,646,231  
Partnership net income (loss) [Abstract]      
Operating Income (Loss) 7,288,862 2,531,700  
Assets      
Total assets 1,023,531,705   $ 944,113,674
Mortgage Revenue Bond Investments Segment [Member]      
Revenues [Abstract]      
Total revenues 10,588,498 8,779,054  
Interest Expense [Abstract]      
Interest expense 4,571,455 3,784,390  
Partnership net income (loss) [Abstract]      
Operating Income (Loss) 2,229,053 2,030,293  
Assets      
Total assets 849,050,799   764,995,675
MF Properties [Member]      
Revenues [Abstract]      
Total revenues 3,792,415 5,074,104  
Interest Expense [Abstract]      
Interest expense 525,587 670,333  
Depreciation [Abstract]      
Depreciation expense 1,355,231 1,646,231  
Partnership net income (loss) [Abstract]      
Operating Income (Loss) 3,745,545 (267,803)  
Assets      
Total assets 120,380,712   129,895,112
Public Housing Capital Fund Trusts [Member]      
Revenues [Abstract]      
Total revenues 708,786 730,902  
Interest Expense [Abstract]      
Interest expense 345,211 300,720  
Partnership net income (loss) [Abstract]      
Operating Income (Loss) 363,575 430,182  
Assets      
Total assets 56,246,529   57,461,268
MBS Securities Investments [Member]      
Revenues [Abstract]      
Total revenues   48,755  
Interest Expense [Abstract]      
Interest expense   14,692  
Partnership net income (loss) [Abstract]      
Operating Income (Loss)   51,984  
Other Investments [Member]      
Revenues [Abstract]      
Total revenues 950,689 287,044  
Partnership net income (loss) [Abstract]      
Operating Income (Loss) 950,689 $ 287,044  
Assets      
Total assets 44,959,622   34,540,280
Consolidation, Eliminations [Member]      
Assets      
Total assets $ (47,105,957)   $ (42,778,661)