Annual report pursuant to Section 13 and 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 $)
 12 Months Ended 0 Months Ended 12 Months Ended
Oct. 23, 2012
Hudson Valley Land Holdings, L.L.C. [Member]
Dec. 31, 2013
150 Main Street, L.L.C. [Member]
Dec. 31, 2012
150 Main Street, L.L.C. [Member]
Oct. 23, 2012
150 Main Street, L.L.C. [Member]
JMP Eastchester, L.L.C. [Member]
Aug. 22, 2013
Eastchester Project [Member]
Oct. 23, 2012
Eastchester Project [Member]
Dec. 31, 2013
Eastchester Project [Member]
Aug. 22, 2013
Eastchester Project [Member]
Hudson Valley Land Holdings, L.L.C. [Member]
Oct. 23, 2012
Eastchester Project [Member]
150 Main Street, L.L.C. [Member]
item
Dec. 31, 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         76.25% 26.25%        
Number of units                 108  
Business acquisition, cash paid         $ 4,900,000 $ 2,100,000        
Third party ownership percentage 47.50%     26.25%       23.75%    
Total project costs             46,000,000      
Maximum borrowing capacity                   27,500,000
Amount of project costs funded by members             18,500,000      
Holding period gain (loss)         0   0      
Percentage return on unrecovered capital   8.00%                
Development management and other services fees   $ 102,000 $ 0              
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.