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Earnings Per Share of Common Stock (Tables)
6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares

The denominator is based on the following weighted average number of common shares:

 

      Three Months Ended June 30,     Six Months Ended June 30,  
      2017     2016     2017     2016  
Basic       8,119,052       7,279,332       8,127,000       7,271,685  
Incremental shares for assumed exercise of options       12,700       28,378       15,157       26,500  
Diluted       8,131,752       7,307,710       8,142,157       7,298,185