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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for Doubtful Accounts [Member] - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 305,171 $ 173,921 $ 92,723
Charged to costs and expenses $ 324,286 $ 131,250 $ 81,198
Deductions
Balance at end of period $ 629,457 $ 305,171 $ 173,921