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Notes Payable and Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 21, 2007
Dec. 15, 2005
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]        
Long-term debt     $ 17,102 $ 17,100
Unsecured Debt [Member] | Promissory Note [Member]        
Debt Instrument [Line Items]        
Long-term debt     $ 4,286 4,286
Payment terms     Annual installment payments.  
Unsecured Debt [Member] | Promissory Note [Member] | Prime Rate [Member]        
Debt Instrument [Line Items]        
Basis spread on variable rate     1.00%  
Unsecured Debt [Member] | Trust Preferred Security Offering, 2005 [Member]        
Debt Instrument [Line Items]        
Long-term debt     $ 9,094 9,092
Fixed interest rate   8.83%    
Payment terms     Interest payments due quarterly.  
Debt issuance costs, net     $ 185 187
Unsecured Debt [Member] | Trust Preferred Security Offering, 2005 [Member] | Three-month LIBOR [Member]        
Debt Instrument [Line Items]        
Basis spread on variable rate   3.75%    
Unsecured Debt [Member] | Trust Preferred Security Offering, 2007 [Member]        
Debt Instrument [Line Items]        
Long-term debt     $ 3,022 3,022
Payment terms     Interest payments due quarterly.  
Debt issuance costs, net     $ 70 71
Unsecured Debt [Member] | Trust Preferred Security Offering, 2007 [Member] | Three-month LIBOR [Member]        
Debt Instrument [Line Items]        
Basis spread on variable rate 3.40%      
Line of Credit [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Amount outstanding     $ 700 700
Payment terms     Interest payment due quarterly  
Line of Credit [Member] | Unsecured Debt [Member] | Prime Rate [Member]        
Debt Instrument [Line Items]        
Percentage bearing variable interest, percentage rate     5.00%  
Line of Credit [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Amount outstanding     $ 0 $ 0
Payment terms      Interest payments due monthly.  
Current borrowing capacity     $ 1,000  
Line of Credit [Member] | Secured Debt [Member] | Prime Rate [Member]        
Debt Instrument [Line Items]        
Percentage bearing variable interest, percentage rate     4.50%