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OPERATING LEASES (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
ft²
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
OPERATING LEASES      
Area occupied by Entity (in square feet) | ft² 51,000    
Rent Expense Recognized Under Operating Leases $ 2,369,101 $ 2,301,930 $ 2,075,919
Future minimum rental payments under operating lease agreements      
Year ending December 31, 2017 1,956,338    
Year ending December 31, 2018 1,827,752    
Year ending December 31, 2019 1,374,550    
Year ending December 31, 2020 614,292    
Year ending December 31, 2021 196,975    
Year ending December 31, 2022 and thereafter 54,726    
Total $ 6,024,633    
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