Stock Based Compensation (Details 4)	12 Months Ended
	May 31, 2020 $ / shares shares
Number of restricted stock units | shares	87,478
Target price | $ / shares	$ 2.99
Restricted Stock Units One
Number of restricted stock units | shares	3,000
Target price | $ / shares	$ 4.00
Restricted Stock Units Two
Number of restricted stock units | shares	3,000
Target price | $ / shares	$ 4.20
Restricted Stock Units Three
Number of restricted stock units | shares	3,000
Target price | $ / shares	$ 4.40
Restricted Stock Units Four
Number of restricted stock units | shares	3,000
Target price | $ / shares	$ 4.60
Restricted Stock Units Five
Number of restricted stock units | shares	3,000
Target price | $ / shares	$ 4.80
Restricted Stock Units Six
Number of restricted stock units | shares	3,000
Target price | $ / shares	$ 5.00