STOCK-BASED COMPENSATION - Employee Stock Option (Details) - Stock Option [Member]	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option Shares, Non-vested shares, beginning of year	5,334
Option Shares, Granted	0
Option Shares, Vested	(2,666)
Option Shares, Forfeited	0
Option Shares, Non-vested shares, end of year	2,668
Weighted Average Grant-Date Fair Value, Non-vested shares, beginning of year (in dollars per share) | $ / shares	$ 4.60
Weighted Average Grant-Date Fair Value, Vested (in dollars per share) | $ / shares	4.60
Weighted Average Grant-Date Fair Value, Forfeited (in dollars per share) | $ / shares	0
Weighted Average Grant-Date Fair Value, Non-vested shares, end of year (in dollars per share) | $ / shares	$ 4.60