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Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Balance at beginning of period $ 629,457 $ 305,171 $ 173,921
Charged to costs and expenses 480,563 324,286 131,250
Deductions
Balance at end of period $ 1,110,020 $ 629,457 $ 305,171