STOCKBASED COMPENSATION (Details 5) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Feb. 28, 2023 USD ($) $ / shares shares
$1.34
Options outstanding, ending (in thousands) | shares | shares	41
Weighted average remaining contractual life (Years) options outstanding	4 years 7 months 20 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 1.34
Option exercisable shares (in thousands) | shares	41
Weighted average remaining contractual life (Years) options exercisable	4 years 7 months 20 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 1.34
$1.64-$1.86
Options outstanding, ending (in thousands) | shares | shares	413
Weighted average remaining contractual life (Years) options outstanding	3 years 6 months 25 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 1.72
Option exercisable shares (in thousands) | shares	298
Weighted average remaining contractual life (Years) options exercisable	3 years 5 months 4 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 1.70
$2.03-$2.40
Options outstanding, ending (in thousands) | shares | shares	196
Weighted average remaining contractual life (Years) options outstanding	2 years 10 months 6 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 2.15
Option exercisable shares (in thousands) | shares	184
Weighted average remaining contractual life (Years) options exercisable	2 years 8 months 15 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 2.15
$2.76-$2.93
Options outstanding, ending (in thousands) | shares | shares	167
Weighted average remaining contractual life (Years) options outstanding	4 years 11 months 23 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 2.92
Option exercisable shares (in thousands) | shares	50
Weighted average remaining contractual life (Years) options exercisable	4 years 25 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 2.89
$3.46-$3.93
Options outstanding, ending (in thousands) | shares | shares	47
Weighted average remaining contractual life (Years) options outstanding	1 year 5 months 1 day
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 3.83
Option exercisable shares (in thousands) | shares	47
Weighted average remaining contractual life (Years) options exercisable	1 year 5 months 1 day
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 3.83
$8.00-$34.00
Options outstanding, ending (in thousands) | shares | shares	197
Weighted average remaining contractual life (Years) options outstanding	6 years 2 months 19 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 9.63
Option exercisable shares (in thousands) | shares	32
Weighted average remaining contractual life (Years) options exercisable	6 years 1 month 20 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 10.17
$1.34-$34.00
Options outstanding, ending (in thousands) | shares | shares	1,061
Weighted average remaining contractual life (Years) options outstanding	4 months 3 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 3.54
Option exercisable shares (in thousands) | shares	652
Weighted average remaining contractual life (Years) options exercisable	3 years 3 months 29 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 2.46
Aggregate intrinsic value for options exercisable | | $	$ 20,151