SHAREHOLDERS' EQUITY - Options Outstanding and Exercisable (Details) - Employee Stock Option - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Shares
Outstanding at beginning of year (in shares)	661,024	764,784	596,148
Granted (in shares)	110,112	111,872	1,038,536
Exercised (in shares)	(196,639)	(191,780)	(224,750)
Cancelled or expired (in shares)	(111,193)	(23,852)	(645,150)
Outstanding at end of year (in shares)	463,304	661,024	764,784
Options exercisable at year end (in shares)	223,158	302,283	227,598
Weighted Avg. Exercise Price
Outstanding at beginning of year (in dollars per share)	$ 19.78	$ 17.31	$ 11.64
Granted (in dollars per share)	38.02	23.60	15.76
Exercised (in dollars per share)	15.37	11.68	8.92
Cancelled or expired (in dollars per share)	26.87	23.71	12.50
Outstanding at end of year (in dollars per share)	24.28	19.78	17.31
Weighted average fair value per option granted during the year (in dollars per share)	$ 18.50	$ 9.12	$ 9.16