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Debt (Details Textual) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Property
Jun. 30, 2011
Jun. 30, 2012
Loan
Property
Jun. 30, 2011
Dec. 31, 2011
Loan
Jun. 26, 2012
Property
Jun. 15, 2012
Jan. 30, 2012
Property
Debt (Textual) [Abstract]                
Revolving credit facility $ 22,000,000   $ 22,000,000   $ 41,000,000      
Revolving credit facility             100,000,000  
Debt (Additional Textual) [Abstract]                
Unused facility fee value 56,000 101,000 124,000 201,000        
Company entered into Amendment             Third  
Revolving credit facility may be increased by approval of the administrative agent             150,000,000  
Percentage of borrowing base properties     60.00%          
Amount of borrowing base properties     100,000,000          
Senior secured term loan 10,100,000   10,100,000   20,100,000      
Non-recourse mortgage loan           39,800,000   20,100,000
Fixed annual interest rate on non-recourse mortgage loan           3.65%   3.79%
Number of properties secured on non-recourse mortgage loan           3   5
Non-recourse mortgage loan maturity date           Mar. 05, 2020   Feb. 05, 2019
Mortgage loans maturity, period between 2015 and 2021   between 2015 and 2021          
Number of mortgage loans payable     6   4      
Mortgage loans payable, value 97,400,000   97,400,000   38,300,000      
Weighted average fixed annual rate 4.00%   4.00%          
Total net investment book value of properties securing the debt 192,900,000   192,900,000   84,200,000      
Properties under borrowing base 12   12          
Maximum [Member]
               
Debt (Textual) [Abstract]                
Outstanding borrowings amount limited on amendment             100,000,000  
Minimum [Member]
               
Debt (Textual) [Abstract]                
Outstanding borrowings amount limited on amendment             $ 80,000,000  
Senior Revolving Credit Agreement [Member]
               
Debt (Textual) [Abstract]                
Maturity date     Jan. 19, 2015          
Extension option on maturity date 12 months   12 months          
Senior Revolving Credit Agreement [Member] | Federal funds effective rate [Member]
               
Debt (Textual) [Abstract]                
Prime, effective and margin rate     0.50%          
Senior Revolving Credit Agreement [Member] | Administrative agent's prime rate [Member]
               
Debt (Textual) [Abstract]                
Prime, effective and margin rate     1.00%          
Senior Revolving Credit Agreement [Member] | Prior to amendment [Member]
               
Debt (Textual) [Abstract]                
Prime, effective and margin rate     0.25%          
Senior Revolving Credit Agreement [Member] | Maximum [Member]
               
Debt (Textual) [Abstract]                
Unused facility fee rate     0.35%          
Senior Revolving Credit Agreement [Member] | Maximum [Member] | LIBOR [Member]
               
Debt (Textual) [Abstract]                
Prime, effective and margin rate     3.50%          
Senior Revolving Credit Agreement [Member] | Minimum [Member]
               
Debt (Textual) [Abstract]                
Unused facility fee rate     0.25%          
Senior Revolving Credit Agreement [Member] | Minimum [Member] | LIBOR [Member]
               
Debt (Textual) [Abstract]                
Prime, effective and margin rate     2.50%          
Senior secured term loan [Member]
               
Debt (Textual) [Abstract]                
Maturity date     Feb. 22, 2013          
Extension option on maturity date               6 months
Senior secured term loan [Member] | Federal funds effective rate [Member]
               
Debt (Textual) [Abstract]                
Prime, effective and margin rate     0.50%          
Senior secured term loan [Member] | LIBOR [Member]
               
Debt (Textual) [Abstract]                
Prime, effective and margin rate     3.50%          
Senior secured term loan [Member] | Administrative agent's prime rate [Member]
               
Debt (Textual) [Abstract]                
Prime, effective and margin rate     1.00%          
Mortgage Loans Payable [Member]
               
Debt (Additional Textual) [Abstract]                
Weighted average fixed annual rate 4.30%   4.30%   5.40%