Stockholders' Equity (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	May 31, 2023 USD ($) $ / shares shares
Schedule summarizes stock option activity
Shares Outstanding at beginning of year (shares) | shares	2,346,248
Shares Granted (shares) | shares	187,826
Shares Exercised (shares) | shares	(47,824)
Shares Forfeited (shares) | shares	(79,701)
Shares Expired (shares) | shares	(200,000)
Shares Outstanding at end of year (shares) | shares	2,206,549
Shares Options exercisable at year-end (shares) | shares	1,408,208
Shares Options expected to vest in future periods (shares) | shares	798,341
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, Outstanding at beginning of year (usd per share) | $ / shares	$ 17.13
Weighted average exercise price Granted (usd per share) | $ / shares	21.54
Weighted average exercise price Exercised (usd per share) | $ / shares	14.79
Weighted average exercise price Forfeited (usd per share) | $ / shares	20.02
Weighted average exercise price Expired (usd per share) | $ / shares	12.14
Weighted average exercise price, Outstanding at end of year (usd per share) | $ / shares	17.90
Weighted average exercise price, Options exercisable at year end (usd per share) | $ / shares	17.12
Weighted average exercise price, Options expected to vest in future periods (usd per share) | $ / shares	$ 19.28
Weighted average remaining contractual life	5 years 10 months 20 days
Weighted average remaining contractual life, Option exercisable at year end	4 years 9 months 7 days
Weighted average remaining contractual life, Option expected to vest in future periods	7 years 10 months 9 days
Aggregate intrinsic value, Outstanding at end of year | $	$ 0
Aggregate intrinsic value, Options exercisable at year end | $	0
Aggregate intrinsic value, Option expected to vest in future periods | $	$ 0