COMMON STOCK AND EARNINGS PER SHARE - Summary of Common Stock and Earnings Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Available to Common Shareholders:
Net Income	$ 14,162,908	$ 3,678,908	$ 25,075,207	$ 16,425,300
Weighted Average Shares Outstanding	5,529,360	5,531,444	5,530,108	5,566,595
Common Shares Applicable to Stock
Options Using the Treasury Stock Method		14,008	31,683	16,463
Total Shares Applicable to Diluted Earnings Per Share	5,529,360	5,545,452	5,561,791	5,583,058
Per Share Information:
Basic Net Income per Share (in dollars per share)	$ 2.56	$ 0.67	$ 4.53	$ 2.95
Diluted Net Income per Share (in dollars per share)	$ 2.56	$ 0.66	$ 4.51	$ 2.94