STOCK PLANS, Stock Options (Details) - Stock Options [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020
Stock options, number of shares [Roll Forward]
Balance, beginning of period (in shares)	597,947	607,631	607,631
Granted (in shares)	0		0
Expired (in shares)	0		0
Cancelled / Forfeited (in shares)	0		0
Exercised (in shares)	0		(9,684)
Balance, end of period (in shares)	597,947	597,947	597,947
Exercisable (vested) at end of period (in shares)	394,704		394,704
Stock options, weighted average exercise price [Roll Forward]
Balance, beginning of period (in dollars per share)	$ 9.01	$ 8.91	$ 8.91
Granted (in dollars per share)	0		0
Expired (in dollars per share)	0		0
Cancelled / Forfeited (in dollars per share)	0		0
Exercised (in dollars per share)	0		3.31
Balance, end of period (in dollars per share)	9.01	$ 9.01	9.01
Exercisable (vested) at end of period (in dollars per share)	$ 8.21		$ 8.21
Stock options, additional disclosures [Abstract]
Outstanding, aggregate intrinsic value	$ 1,342,898		$ 1,342,898
Exercisable (vested), aggregate intrinsic value	$ 1,200,243		$ 1,200,243
Outstanding, weighted average remaining contractual term	6 years 3 months 29 days		6 years 3 months 29 days
Exercisable (vested), weighted average remaining contractual term	5 years 4 months 9 days		5 years 4 months 9 days
Intrinsic value of options exercised			$ 63,000	$ 96,000
Fair value of awards vested			182,000	$ 149,000
Unrecognized compensation related to non-vested stock options	$ 246,000		$ 246,000
Unrecognized compensation cost, period for recognition			2 years 29 days
Recognized compensation cost	$ 35,000		$ 75,000