STOCKBASED COMPENSATION (Details 6) - $ / shares	3 Months Ended		9 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Employees Member
Annual RSUs granted		0	151,800	120,000
Weighted average market value on the date of the grant of annual RSUs	$ 0	$ 0	$ 8.03	$ 3.17
Annual restricted shares granted		0	7,500	0
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		0	0	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		0	80,400	270,000
Performance restricted shares granted based on revenue target thresholds maximum	0	0	23,700	0
Weighted average market value on the date of the grant of PRSUs, performance restricted shares	$ 0	$ 0	$ 8.00	$ 3.41
Board Of Directors
Annual RSUs granted	0	0	44,000	43,000
Weighted average market value on the date of the grant of annual RSUs		$ 0	$ 11.35	$ 8.02
PRSUs granted based on revenue target thresholds maximum			30,000
Weighted average market value on the date of the grant of PRSUs	$ 0	$ 0	$ 8.00	$ 0