STOCKBASED COMPENSATION (Details 5) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Nov. 30, 2022 USD ($) $ / shares shares
$1.34
Options outstanding, ending (in thousands) | shares | shares	51
Weighted average remaining contractual life (Years) options outstanding	4 years 10 months 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	4 years 10 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	542
Weighted average remaining contractual life (Years) options outstanding	3 years 9 months 3 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 1.71
Option exercisable shares (in thousands) | shares	385
Weighted average remaining contractual life (Years) options exercisable	3 years 7 months 9 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 1.69
$2.03-$2.40
Options outstanding, ending (in thousands) | shares | shares	341
Weighted average remaining contractual life (Years) options outstanding	2 years 11 months 15 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 2.21
Option exercisable shares (in thousands) | shares	328
Weighted average remaining contractual life (Years) options exercisable	2 years 10 months 13 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 2.21
$2.76-$2.93
Options outstanding, ending (in thousands) | shares | shares	197
Weighted average remaining contractual life (Years) options outstanding	5 years 18 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 2.91
Option exercisable shares (in thousands) | shares	65
Weighted average remaining contractual life (Years) options exercisable	3 years 10 months 20 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 2.88
$3.46-$3.93
Options outstanding, ending (in thousands) | shares | shares	93
Weighted average remaining contractual life (Years) options outstanding	1 year 8 months 1 day
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 3.83
Option exercisable shares (in thousands) | shares	93
Weighted average remaining contractual life (Years) options exercisable	1 year 8 months 1 day
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 3.83
$8.00-$24.83
Options outstanding, ending (in thousands) | shares | shares	204
Weighted average remaining contractual life (Years) options outstanding	6 years 5 months 19 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 9.52
Option exercisable shares (in thousands) | shares	23
Weighted average remaining contractual life (Years) options exercisable	6 years 4 months 17 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 10.24
$1.34-$24.83
Options outstanding, ending (in thousands) | shares | shares	1,428
Weighted average remaining contractual life (Years) options outstanding	4 years 14 days
Weighted average exercise price outstanding, ending | $ / shares | $ / shares	$ 3.23
Option exercisable shares (in thousands) | shares	945
Weighted average remaining contractual life (Years) options exercisable	3 years 3 months 25 days
Weighted average exercise price for options exercisable | $ / shares | $ / shares	$ 2.36
Aggregate intrinsic value for options exercisable | | $	$ 22,412