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OPERATING LEASES (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
ft²
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
OPERATING LEASES      
Area occupied by Entity (in square feet) | ft² 51,000    
Rent Expense Recognized Under Operating Leases $ 2,301,930 $ 2,075,919 $ 2,163,281
Future minimum rental payments under operating lease agreements      
Year ending December 31, 2016 2,000,012    
Year ending December 31, 2017 1,872,569    
Year ending December 31, 2018 1,735,223    
Year ending December 31, 2019 1,322,660    
Year ending December 31, 2020 600,488    
Year ending December 31, 2021 and thereafter 286,560    
Total $ 7,817,512    
Maximum      
OPERATING LEASES      
Lease term 7 years    
Michigan      
OPERATING LEASES      
Area occupied by Entity (in square feet) | ft² 17,500    
Texas      
OPERATING LEASES      
Area occupied by Entity (in square feet) | ft² 51,000    
South Carolina      
OPERATING LEASES      
Area occupied by Entity (in square feet) | ft² 57,000