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Income Taxes - Components of Income Tax Provision (Detail) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Current:    
Federal   $ 5,485
State $ 45,693 48,402
Total 45,693 53,887
Deferred:    
Federal 207,019 99,358
State 53,243 18,692
Total 260,262 118,050
Income tax provision $ 305,955 $ 171,937