STOCKBASED COMPENSATION (Details 4) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Aug. 31, 2022 USD ($) $ / shares shares
$1.34
Options outstanding, ending (in thousands) | shares | shares	51
Weighted average remaining contractual life (Years) options outstanding	5 years 1 month 20 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 1.34
Option exercisable shares (in thousands) | shares	51
Weighted average remaining contractual life (Years) options exercisable	5 years 1 month 20 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 1.34
$1.64-$1.86
Options outstanding, ending (in thousands) | shares | shares	586
Weighted average remaining contractual life (Years) options outstanding	3 years 10 months 20 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 1.71
Option exercisable shares (in thousands) | shares	387
Weighted average remaining contractual life (Years) options exercisable	3 years 8 months 1 day
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 1.70
$2.03-$2.42
Options outstanding, ending (in thousands) | shares | shares	451
Weighted average remaining contractual life (Years) options outstanding	3 years 21 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 2.25
Option exercisable shares (in thousands) | shares	428
Weighted average remaining contractual life (Years) options exercisable	2 years 11 months 19 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 2.25
$2.76-$2.93
Options outstanding, ending (in thousands) | shares | shares	204
Weighted average remaining contractual life (Years) options outstanding	5 years 3 months 25 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 2.91
Option exercisable shares (in thousands) | shares	60
Weighted average remaining contractual life (Years) options exercisable	4 years
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 2.88
$3.46-$3.93
Options outstanding, ending (in thousands) | shares | shares	100
Weighted average remaining contractual life (Years) options outstanding	1 year 11 months 1 day
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 3.84
Option exercisable shares (in thousands) | shares	100
Weighted average remaining contractual life (Years) options exercisable	1 year 11 months 1 day
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 3.84
$8.00-$19.85
Options outstanding, ending (in thousands) | shares | shares	200
Weighted average remaining contractual life (Years) options outstanding	6 years 8 months 15 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 9.24
Option exercisable shares (in thousands) | shares	11
Weighted average remaining contractual life (Years) options exercisable	6 years 6 months 21 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 11.13
$1.34-$19.85
Options outstanding, ending (in thousands) | shares | shares	1,592
Weighted average remaining contractual life (Years) options outstanding	4 years 1 month 9 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 3.08
Option exercisable shares (in thousands) | shares	1,037
Weighted average remaining contractual life (Years) options exercisable	3 years 3 months 29 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 2.29
Aggregate intrinsic value for options exercisable | | $	$ 12,715