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Significant Accounting Policies (Details Textual) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Significant Accounting Policies (Additional Textual) [Abstract]          
Decreased rental revenues $ 103,000 $ 138,000 $ 272,000 $ 391,000  
Net accumulated amortization of intangible assets 7,700,000   7,700,000   4,500,000
Net accumulated amortization of intangible Liabilities 500,000   500,000   300,000
Remaining weighted average lease term related to these intangible assets and liabilities     P4Y9M18D    
Deferred financing cost accumulated amortization 1,100,000   1,100,000   500,000
Required percentage of annual REIT taxable income distribute to stockholders     90.00%    
Net unamortized mortgage premiums 800,000   800,000   600,000
Estimated fair values of the mortgage and term loans payable 108,700,000   108,700,000   59,200,000
Above market leases [Member]
          
Significant Accounting Policies (Textual) [Abstract]          
Leases 3,100,000   3,100,000   2,300,000
Below market leases [Member]
          
Significant Accounting Policies (Textual) [Abstract]          
Leases 2,200,000   2,200,000   1,200,000
In-place leases [Member]
          
Significant Accounting Policies (Textual) [Abstract]          
Leases $ 19,800,000   $ 19,800,000   $ 12,500,000