NET INCOME (LOSS) PER COMMON SHARE (Earnings per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income (dollars in thousands)	$ (1,180)	$ 1,102	$ 3,659	$ 2,510	$ 22,124	$ 4,315	$ 1,914	$ (2,219)	$ 6,091	$ 26,134	$ 12,462
Denominator:
Weighted-average common shares outstanding	31,097,000	31,085,000	31,031,000	30,860,000	30,782,000	30,736,000	30,669,000	30,352,000	31,018,356	30,634,553	30,104,552
Weighted-average effect of assumed conversion of stock options and restricted stock									276,217	669,174	860,225
Weighted-average common shares and share equivalents outstanding	31,097,000	31,235,000	31,288,000	31,290,000	31,295,000	31,320,000	31,170,000	30,352,000	31,294,573	31,303,727	30,964,777
Net income per common share:
Basic	$ (0.04)	$ 0.04	$ 0.12	$ 0.08	$ 0.72	$ 0.14	$ 0.06	$ (0.07)	$ 0.20	$ 0.85	$ 0.41
Diluted	$ (0.04)	$ 0.04	$ 0.12	$ 0.08	$ 0.71	$ 0.14	$ 0.06	$ (0.07)	$ 0.19	$ 0.83	$ 0.40