Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Additional Information (Details)

v3.7.0.1
Earnings Per Share - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Common stock dividends $ 495,266 $ 482,090 $ 990,531 $ 964,180
Common stock dividends per share $ 0.065 $ 0.065 $ 0.13 $ 0.13