COMMON STOCK AND EARNINGS PER SHARE - Summary of Common Stock and Earnings Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Available to Common Shareholders:
Net Income	$ 10,596,798	$ 14,162,908	$ 17,064,897	$ 25,075,207
Weighted Average Shares Outstanding	4,951,469	5,529,360	5,147,580	5,530,108
Common Shares Applicable to Stock
Options Using the Treasury Stock Method				31,683
Total Shares Applicable to Diluted Earnings Per Share	4,951,469	5,529,360	5,147,580	5,561,791
Basic
Net Income from Continuing Operations (in dollars per share)	$ 2.17	$ 2.61	$ 3.38	$ 4.59
Net Loss from Discontinued Operations (Net of Tax) (in dollars per share)	(0.03)	(0.05)	(0.06)	(0.06)
Net Income (in dollars per share)	2.14	2.56	3.32	4.53
Diluted
Net Income from Continuing Operations (in dollars per share)	2.17	2.61	3.38	4.57
Net Loss from Discontinued Operations (Net of Tax) (in dollars per share)	(0.03)	(0.05)	(0.06)	(0.06)
Net Income (in dollars per share)	$ 2.14	$ 2.56	$ 3.32	$ 4.51