EARNINGS PER SHARE (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
EARNINGS PER SHARE [Abstract]
Net income	$ 6,183,684	$ 24,469,808	$ 20,053,269
Weighted average shares [Abstract]
Basic (in shares)		7,315,144	7,242,212
Effect of dilutive securities [Abstract]
Stock options (in shares)		33,881	91,156
Restricted stock units (in shares)		2,360	0
Diluted (in shares)		7,351,385	7,333,368
Net income per share [Abstract]
Basic (in dollars per share)		$ 3.35	$ 2.77
Diluted (in dollars per share)		$ 3.33	$ 2.73
Stock Options [Member]
Net Income Per Share [Abstract]
Antidilutive securities excluded from earnings per share calculation (in shares)		150,000	50,000