Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets (Details Textual)

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Real Estate and Intangible Assets (Details Textual) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Property
Jun. 30, 2011
Feb. 29, 2012
South Hadley Massachusetts [Member]
Jun. 30, 2012
South Hadley Massachusetts [Member]
Lease
Jun. 30, 2012
San Antonio Texas [Member]
Lease
Feb. 14, 2012
San Antonio Texas [Member]
Jun. 30, 2012
Roseville Minnesota [Member]
Lease
Feb. 27, 2012
Roseville Minnesota [Member]
Jun. 30, 2012
Hialeah Florida [Member]
Jun. 27, 2012
Hialeah Florida [Member]
Jun. 30, 2012
Five properties acquired [Member]
Jun. 30, 2012
Five properties acquired [Member]
Real Estate and Intangible Assets (Textual) [Abstract]                            
Number of properties acquired     5                      
Acquisition-related costs excluded in pro-forma earnings $ 528,000 $ 131,000 $ 688,000 $ (8,000)                 $ 500,000 $ 500,000
Amount failed to pay for property annualized taxes     8,000,000                      
Period for lease expiration           2012-02 2014-02   2012-12   2022-03      
Number of available options to extend lease for additional periods           1 2   1          
Option to extend lease term           1 year 8 years   5 years   5 years      
Option to extend lease term one             5 years              
Option to extend lease term two             5 years              
Amount of annualized straight line rents over the life of the lease         300,000                  
Capital lease rent expense               800,000   2,900,000   1,100,000    
Tenant allowance               600,000   400,000   300,000    
Period of tenant allowance payable             2 years   2 years          
Leasing commission paid     1,101,000       300,000   800,000          
Future annualized rents                 $ 1,200,000          
Option to extend lease term                 5 years