Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (150 Main Street, L.L.C.) (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (150 Main Street, L.L.C.) (Narrative) (Details) (USD $)
 9 Months Ended 0 Months Ended 9 Months Ended
Sep. 30, 2013
Jul. 15, 2013
Oct. 23, 2012
JMP Eastchester, L.L.C. [Member]
Aug. 22, 2013
Hudson Valley Land Holdings, L.L.C. [Member]
Oct. 23, 2012
Hudson Valley Land Holdings, L.L.C. [Member]
Sep. 30, 2013
150 Main Street, L.L.C. [Member]
Sep. 30, 2012
150 Main Street, L.L.C. [Member]
Sep. 30, 2013
150 Main Street, L.L.C. [Member]
Hudson Valley Land Holdings, L.L.C. [Member]
Oct. 23, 2012
Eastchester Project [Member]
Sep. 30, 2013
Eastchester Project [Member]
Aug. 22, 2013
Eastchester Project [Member]
Oct. 23, 2012
Eastchester Project [Member]
150 Main Street, L.L.C. [Member]
item
Sep. 30, 2013
Construction Loan [Member]
Eastchester Project [Member]
150 Main Street, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]                          
Percentage of interest in venture                 26.25%   76.25%    
Number of units                       108  
Business acquisition, cash paid                 $ 4,900,000        
Third party ownership percentage     26.25% 23.75% 47.50%                
Total project costs                   46,000,000      
Maximum borrowing capacity 600,000,000 600,000,000                     27,500,000
Amount of project costs funded by members                   18,500,000      
Preferred rate of return           8.00%   8.00%          
Development management and other services fees           $ 87,000 $ 102,000            
Holding and distribution pattern under operating agreement                   The operating agreement of Eastchester provides, among other things, for the distribution of net operating cash flow to the members, as follows:to HVLH to the extent of its accrued but unpaid preferred return of eight percent on the unrecovered allocated land value, as defined; to the members, pro rata, to the extent of their respective accrued but unpaid return of eight percent on their unrecovered capital percentages; andto the members in accordance with their ownership percentages.