STOCKHOLDERS' EQUITY - Restricted stock unit (Details) - Restricted stock	9 Months Ended
	Sep. 30, 2021 USD ($) shares
Restricted Stock Units, Beginning Balance	2,447,200
Restricted Stock Units, Intrinsic Value Beginning Balance | $	$ 19,504,184
Restricted Stock Units, Granted	368,500
Restricted Stock Units, Forfeited	(90,750)
Restricted Stock Units, Ending Balance	2,724,950
Restricted Stock Units, Intrinsic Value Ending Balance | $	$ 22,126,594
Board of Directors
Restricted Stock Units, Beginning Balance	277,200
Restricted Stock Units, Granted	0
Restricted Stock Units, Forfeited	0
Restricted Stock Units, Ending Balance	277,200
Executive Management
Restricted Stock Units, Beginning Balance	724,500
Restricted Stock Units, Granted	0
Restricted Stock Units, Forfeited	0
Restricted Stock Units, Ending Balance	724,500
Other Employees
Restricted Stock Units, Beginning Balance	1,445,500
Restricted Stock Units, Granted	368,500
Restricted Stock Units, Forfeited	(90,750)
Restricted Stock Units, Ending Balance	1,723,250