STOCK-BASED COMPENSATION (Details 5) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	May 31, 2023 USD ($) $ / shares shares
$1.34
Options outstanding, ending (in thousands) | shares | shares	41
Weighted average remaining contractual life (Years) options outstanding	4 years 4 months 20 days
Weighted average exercise price for options outstanding | $ / shares | $ / shares	$ 1.34
Option exercisable shares (in thousands) | shares	41
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 1.34
Weighted average remaining contractual life (Years) options exercisable	4 years 4 months 20 days
$1.64-$1.86
Options outstanding, ending (in thousands) | shares | shares	365
Weighted average remaining contractual life (Years) options outstanding	3 years 6 months 10 days
Weighted average exercise price for options outstanding | $ / shares | $ / shares	$ 1.72
Option exercisable shares (in thousands) | shares	291
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 1.70
Weighted average remaining contractual life (Years) options exercisable	3 years 5 months 12 days
$2.03-$2.40
Options outstanding, ending (in thousands) | shares | shares	185
Weighted average remaining contractual life (Years) options outstanding	2 years 7 months 9 days
Weighted average exercise price for options outstanding | $ / shares | $ / shares	$ 2.14
Option exercisable shares (in thousands) | shares	175
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 2.14
Weighted average remaining contractual life (Years) options exercisable	2 years 5 months 23 days
$2.93
Options outstanding, ending (in thousands) | shares | shares	139
Weighted average remaining contractual life (Years) options outstanding	5 years 1 month 13 days
Weighted average exercise price for options outstanding | $ / shares | $ / shares	$ 2.93
Option exercisable shares (in thousands) | shares	35
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 2.93
Weighted average remaining contractual life (Years) options exercisable	5 years 1 month 13 days
$3.46-$3.93
Options outstanding, ending (in thousands) | shares | shares	37
Weighted average remaining contractual life (Years) options outstanding	1 year 1 month 9 days
Weighted average exercise price for options outstanding | $ / shares | $ / shares	$ 3.93
Option exercisable shares (in thousands) | shares	37
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 3.93
Weighted average remaining contractual life (Years) options exercisable	1 year 1 month 9 days
$8.00-34.00
Options outstanding, ending (in thousands) | shares | shares	194
Weighted average remaining contractual life (Years) options outstanding	5 years 11 months 19 days
Weighted average exercise price for options outstanding | $ / shares | $ / shares	$ 9.77
Option exercisable shares (in thousands) | shares	41
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 10.18
Weighted average remaining contractual options exercisable	5 years 10 months 24 days
$1.34-$34.00
Options outstanding, ending (in thousands) | shares | shares	961
Weighted average remaining contractual life (Years) options outstanding	4 years 7 days
Weighted average exercise price for options outstanding | $ / shares | $ / shares	$ 3.67
Option exercisable shares (in thousands) | shares	620
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 2.56
Weighted average remaining contractual life (Years) options exercisable	3 years 4 months 6 days
Aggregate intrinsic value for options exercisable | | $	$ 18,895