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Income Taxes - Components of Income Tax Provision (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Current:        
Federal $ 4,699   $ 10,184  
State 51,838 $ 32,972 100,240 $ 84,362
Total 56,537 32,972 110,424 84,362
Deferred:        
Federal 118,061 403,358 217,419 8,133
State 21,885 76,497 40,577 (15,748)
Total 139,946 479,855 257,996 (7,615)
Income tax provision $ 196,483 $ 512,827 $ 368,420 $ 76,747