EARNINGS PER SHARE - Earnings per share - Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2026	Jan. 31, 2025
Numerator:
Net Income (Loss)	$ 3,147	$ 717	$ 9,039	$ 8,823
Denominator:
Weighted average number of common shares outstanding - basic (in shares)	5,340	5,321	5,334	5,316
Dilutive effect of unvested shares of restricted common stock	34	32	35	32
Dilutive effect of shares issuable upon the exercise of stock options that are in-the-money	15	28	15	28
Weighted average number of common shares outstanding - diluted (in shares)	5,389	5,381	5,384	5,376
Earnings per share - diluted (in dollars per share)	$ 0.58	$ 0.13	$ 1.68	$ 1.64