Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Additional Information (Details)

v3.10.0.1
Earnings Per Share - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Common stock dividends $ 500,020 $ 495,266 $ 1,495,307 $ 1,485,797
Common stock dividends per share $ 0.065 $ 0.065 $ 0.13 $ 0.13