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NOTES PAYABLE AND CREDIT AGREEMENT (Details)
6 Months Ended 12 Months Ended
Dec. 05, 2013
USD ($)
Jun. 30, 2015
USD ($)
Installment
Dec. 31, 2014
USD ($)
Installment
Dec. 31, 2013
USD ($)
Debt Instrument [Line Items]        
Payments/Long term debt, Total   $ 42,859,000 $ 35,617,000  
Less current portion   (800,000) (883,000)  
Long term portion   42,059,000 $ 34,734,000  
Balance of notes payable   $ 258,133    
Notes Payable, Other Payables [Member]        
Debt Instrument [Line Items]        
Average effective interest rate (in hundredths)   3.25% 3.25%  
Remaining revolving credit outstanding       $ 250,000
Aggregate amount of notes payable   $ 1,350,000 $ 466,172  
Aggregate principal installments   $ 325,000 $ 233,086  
Number of annual installments | Installment   2 2  
Minimum [Member]        
Debt Instrument [Line Items]        
Spread on Libor variable rate (in hundredths)   1.50%    
Spread on base variable rate (in hundredths)   0.10%    
Percentage of unused commitment fee (in hundredths)   0.10%    
Maximum [Member]        
Debt Instrument [Line Items]        
Spread on Libor variable rate (in hundredths)   2.50%    
Spread on base variable rate (in hundredths)   1.00%    
Percentage of unused commitment fee (in hundredths)   0.25%    
Credit Facility [Member]        
Debt Instrument [Line Items]        
Payments/Long term debt, Total   $ 41,000,000 $ 34,500,000  
Average effective interest rate (in hundredths)   2.30%    
Revolving credit facility commitment $ 125,000,000      
Maturity Date Nov. 30, 2018      
Remaining revolving credit outstanding   $ 84,000,000    
3.25 % notes payable due in next year [Member]        
Debt Instrument [Line Items]        
Payments/Long term debt, Total   1,859,000 $ 1,117,000  
Annual installments   $ 800,000    
Percentage of interest accrued (in hundredths)   3.25%