Annual report pursuant to Section 13 and 15(d)

Real Estate Transactions (Consolidation) (Narrative) (Details)

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Real Estate Transactions (Consolidation) (Narrative) (Details) (USD $)
0 Months Ended 12 Months Ended
Aug. 22, 2013
Oct. 23, 2012
Dec. 31, 2013
Hudson Valley Land Holdings, L.L.C. [Member]
     
Real Estate Properties [Line Items]      
Third party ownership percentage   47.50%  
Eastchester Project [Member]
     
Real Estate Properties [Line Items]      
Business acquisition, cash paid $ 4,900,000 $ 2,100,000  
Percentage of interest in venture 76.25% 26.25%  
Total project costs     46,000,000
Amount of project costs funded by members     18,500,000
Holding period gain (loss) 0   0
Eastchester Project [Member] | Hudson Valley Land Holdings, L.L.C. [Member]
     
Real Estate Properties [Line Items]      
Third party ownership percentage 23.75%    
150 Main Street, L.L.C. [Member] | JMP Eastchester, L.L.C. [Member]
     
Real Estate Properties [Line Items]      
Third party ownership percentage   26.25%  
150 Main Street, L.L.C. [Member] | Eastchester Project [Member]
     
Real Estate Properties [Line Items]      
Number of units   108  
Construction Loan [Member] | 150 Main Street, L.L.C. [Member] | Eastchester Project [Member]
     
Real Estate Properties [Line Items]      
Maximum borrowing capacity     $ 27,500,000