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DEBT (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
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Dec. 31, 2011
item
Debt Instruments    
Notes Payable 25,027,877 11,131,405
Less Current Maturities (10,615,279) (5,802,513)
Notes payable, Noncurrent 14,412,598 5,328,892
Annual maturities of notes payable    
2013 10,615,279  
2014 7,933,416  
2015 4,810,458  
2016 1,540,360  
2017 128,364  
Total 25,027,877 11,131,405
Revolving credit facility
    
Debt Instruments    
Maximum borrowing capacity 5,000,000  
Line of credit facility, base rate prime rate  
Debt instrument stated rate (as a percent) 5.00%  
Notes Payable to commercial banks
    
Debt Instruments    
Notes Payable 24,553,291 9,827,949
Annual maturities of notes payable    
Total 24,553,291 9,827,949
Notes payable with interest rate between 3.50% and 6.35%
    
Debt Instruments    
Number of notes payable 7 7
Minimum interest rate 3.50% 3.50%
Maximum interest rate 6.35% 6.35%
Notes payable with interest rate between 3.50% and 6.35% | Minimum
    
Debt Instruments    
Monthly principal installments 50,170 50,170
Notes payable with interest rate between 3.50% and 6.35% | Maximum
    
Debt Instruments    
Monthly principal installments 223,437 223,437
Notes payable with interest rate at 6.00%
    
Debt Instruments    
Number of notes payable   2
Notes Payable to finance companies
    
Debt Instruments    
Notes Payable   904,103
Annual maturities of notes payable    
Total   904,103
Notes payable with interest rate between 5.33% and 6.00%
    
Debt Instruments    
Number of notes payable 3 3
Minimum interest rate 5.33% 5.33%
Maximum interest rate 6.00% 6.00%
Notes payable with interest rate between 5.33% and 6.00% | Minimum
    
Debt Instruments    
Monthly principal installments 23,740 23,740
Notes payable with interest rate between 5.33% and 6.00% | Maximum
    
Debt Instruments    
Monthly principal installments 61,997 61,997
Notes Payable to finance companies for insurance notes
    
Debt Instruments    
Notes Payable 474,586 399,353
Annual maturities of notes payable    
Total 474,586 399,353
Notes payable with interest rate between 4.16% and 4.95%
    
Debt Instruments    
Number of notes payable 2 2
Minimum interest rate 4.16% 4.16%
Maximum interest rate 4.95% 4.95%
Notes payable with interest rate between 4.16% and 4.95% | Minimum
    
Debt Instruments    
Monthly principal installments 16,861 16,861
Notes payable with interest rate between 4.16% and 4.95% | Maximum
    
Debt Instruments    
Monthly principal installments 302,892 302,892