NET INCOME (LOSS) PER COMMON SHARE (Earnings per Share) (Details) - USD ($) $ / shares in Units, $ 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
Numerator:
Net income (loss) (in thousands)	$ 1,914	$ (2,219)	$ 6,721	$ 3,968	$ (305)	$ 10,689
Denominator:
Weighted-average common shares outstanding	30,669,272		30,189,067		30,511,611	29,957,541
Weighted-average common shares and common share equivalents outstanding	31,170,139		30,830,381		30,511,611	30,757,863
Net income (loss) per common share:
Basic	$ 0.06		$ 0.22		$ (0.01)	$ 0.36
Diluted	$ 0.06		$ 0.22		$ (0.01)	$ 0.35