STOCKBASED COMPENSATION (Details 6) - $ / shares	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Employees Member
Annual RSUs granted	152,000	120,000	161,000
Weighted average market value on the date of the grant of annual RSUs	$ 8.03	$ 3.17	$ 1.86
Annual restricted shares granted	8,000	0
Weighted average market value on the date of the grant of annual restricted shares	$ 8.00	$ 0	$ 0
RSUs granted in lieu of cash payment for salary reductions		89,000	18,000
Weighted average market value on the date of the grant of RSU in lieu of cash payment	$ 0	$ 2.50	$ 2.21
PRSUs granted based on revenue target thresholds maximum	80,000	270,000
Performance restricted shares granted based on revenue target thresholds maximum	24,000
Weighted average market value on the date of the grant of PRSUs, performance restricted shares	$ 8.00	$ 3.41	$ 0
Board Of Directors
Annual RSUs granted	44,000	43,000	161,000
Weighted average market value on the date of the grant of annual RSUs	$ 11.35	$ 8.02	$ 1.81
PRSUs granted based on revenue target thresholds maximum	25,000
Weighted average market value on the date of the grant of PRSUs	$ 8.00	$ 0	$ 0