EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share, Basic and Diluted [Abstract]
Net earnings attributable to common shareholders - basic and diluted	$ 19,846	$ 17,360	$ 20,098	$ 16,188	$ 37,206	$ 36,286
Basic and diluted common shares outstanding [Abstract]
Weighted average common shares outstanding - basic (in shares)	13,372		13,312		13,347	13,334
Effect of dilutive shares (in shares)	19		38		47	74
Weighted average shares common outstanding - diluted (in shares)	13,391		13,350		13,394	13,408
Earnings per common share - basic (in dollars per share)	$ 1.48		$ 1.51		$ 2.79	$ 2.72
Earnings per common share - diluted (in dollars per share)	$ 1.48		$ 1.51		$ 2.78	$ 2.71