EARNINGS PER SHARE, Calculation of Basic and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share, Basic and Diluted [Abstract]
Net earnings attributable to common shareholders - basic and diluted	$ 31,413	$ 23,518	$ 19,846	$ 17,360	$ 54,931	$ 37,206
Basic and diluted common shares outstanding [Abstract]
Weighted average common shares outstanding - basic (in shares)	13,332		13,372		13,333	13,347
Effect of dilutive shares (in shares)	100		19		98	47
Weighted average shares common outstanding - diluted (in shares)	13,432		13,391		13,431	13,394
Earnings per common share - basic (in dollars per share)	$ 2.36		$ 1.48		$ 4.12	$ 2.79
Earnings per common share - diluted (in dollars per share)	$ 2.34		$ 1.48		$ 4.09	$ 2.78