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LONG-TERM OBLIGATIONS (Detail Textuals) (USD $)
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2011
Apr. 06, 2010
Line of Credit Facility [Line Items]      
Non-cancelable operating lease obligations $ 1,397,000    
First Tennessee Bank National Association | Revolving credit facility
      
Line of Credit Facility [Line Items]      
Unsecured revolving credit facility   $ 25,000,000 $ 20,000,000
Description of reference rate basis LIBOR Market Index Rate    
Variable interest rate in addition to reference rate 1.50%    
Interest rate 1.69%    
First Tennessee Bank National Association | Revolving credit facility | Minimum
      
Line of Credit Facility [Line Items]      
Non-usage fee for current loan agreement in annual amount percentage 0.15%    
First Tennessee Bank National Association | Revolving credit facility | Maximum
      
Line of Credit Facility [Line Items]      
Non-usage fee for current loan agreement in annual amount percentage 0.35%