STOCK-BASED COMPENSATION (Details 6) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2022	Nov. 30, 2021	Nov. 30, 2022	Nov. 30, 2021
Employees Member
Annual RSUs granted		1,000	151,800	120,000
Weighted average market value on the date of the grant of annual RSUs	$ 0	$ 24.57	$ 8.03	$ 3.17
Annual restricted shares granted			7,500
Weighted average market value on the date of the grant of annual restricted shares	0	0	$ 8.00	$ 0
RSUs granted in lieu of cash payment for salary reductions				89,000
Weighted average market value on the date of the grant of RSU in lieu of cash payment	0	0	$ 0	$ 2.50
PRSUs granted based on revenue target thresholds maximum			80,400	270,000
Performance restricted shares granted based on revenue target thresholds maximum			23,700
Weighted average market value on the date of the grant of PRSUs, performance restricted shares	$ 0	$ 0	$ 8.00	$ 3.41
Stock-based compensation expense	$ 179,000	$ 0	$ 283,000	$ 246,000
Board Of Directors
Annual RSUs granted	14,000	13,000	44,000	43,000
Weighted average market value on the date of the grant of annual RSUs	$ 18.50	$ 19.85	$ 11.35	$ 8.02
PRSUs granted based on revenue target thresholds maximum			30,000
Stock-based compensation expense	$ 245,000	$ 0	$ 490,000	$ 0
Weighted average market value on the date of the grant of PRSUs	$ 0	$ 0	$ 8.00	$ 0