Annual report pursuant to Section 13 and 15(d)

Mandatorily Redeemable Preferred Stock (Details Textual)

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Mandatorily Redeemable Preferred Stock (Details Textual) (USD $)
1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended
Feb. 29, 2012
Dec. 31, 2012
Dec. 31, 2011
Feb. 29, 2012
Mandatorily Redeemable Preferred Stock [Member]
Dec. 31, 2012
Mandatorily Redeemable Preferred Stock [Member]
Feb. 29, 2012
Series C Preferred Stock [Member]
Dec. 31, 2012
Series C Preferred Stock [Member]
Mandatorily Redeemable Preferred Stock (Textual) [Abstract]              
Public offering of preferred stock   2,150,000 2,150,000 1,540,000      
Series C preferred stock           7.125% 7.125%
Preferred Stock, par value   $ 0.001 $ 0.001 $ 0.001      
Public offering price       $ 25.00      
Gross proceeds of the offering totaled       $ 38,500,000      
Net proceeds, after deducting offering expenses       36,700,000      
Fair value of term preferred stock   38,500,000     39,500,000    
Carrying value term preferred stock   2,000 2,000   38,500,000    
Closing price term preferred stock         $ 25.64    
Mandatorily Redeemable Preferred Stock (Additional Textual) [Abstract]              
Preferred shares at a redemption price $ 25.00            
Deferred financing fees $ 1,800,000            
Preferred Stock redemption term On or after January 31, 2016, we may redeem the shares at a redemption price of $25.00 per share, plus any accumulated and unpaid dividends to and including the date of redemption.            
Preferred Stock mandatory redemption date Jan. 31, 2017