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Debt (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Long Term Debt Unclassified [Line Items]    
Total debt $ 105,553,000  
Debt (Textual) [Abstract]    
Proceeds on revolving credit facility 15,800,000 8,200,000
Repayments on revolving credit facility 12,500,000 10,300,000
Secured Borrowings [Member]
   
Long Term Debt Unclassified [Line Items]    
Rate of cash premium 10.00%  
Debenture [Member]
   
Long Term Debt Unclassified [Line Items]    
Total debt $ 6,000,000  
SBIC debenture interest rate 2.351%  
Annual fees 0.515%  
Debenture maturity period 10 years