STOCK-BASED COMPENSATION (Stock Option Activity and Intrinsic Value) (Details) - Stock Options Plans - USD ($)	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Options Activity [Roll Forward]
Options outstanding, beginning of year (in shares)	500,168
Granted (in shares)	4,898
Exercised (in shares)	(23,494)
Forfeited (in shares)	(4,000)
Expired (in shares)	0
Options outstanding, end of period (in shares)	477,572
Options exercisable, end of period (in shares)	189,701
Weighted Average Exercise Price [Roll Forward]
Options outstanding, beginning of year (in dollars per share)	$ 93.89
Granted (in dollars per share)	160.08
Exercised (in dollars per share)	76.99
Forfeited (in dollars per share)	100.79
Expired (in dollars per share)	0
Options outstanding, end of period (in dollars per share)	95.34
Options exercisable, end of period (in dollars per share)	$ 82.04
Stock Option Activity Additional Disclosures [Abstract]
Weighted-average remaining contractual term, options outstanding, end of period	6 years 2 months 12 days
Aggregate intrinsic value, options outstanding, end of period	$ 31,007,801
Weighted-average remaining contractual terms, options exercisable, end of period	4 years
Aggregate intrinsic value, options exercisable, end of period	$ 14,835,182
Intrinsic value of options exercised	$ 2,021,676	$ 0