STOCK-BASED COMPENSATION (Summary of Stock Option Activity) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	May 31, 2018	Feb. 28, 2018
Number of Options
Outstanding, beginning balance	980
Granted
Exercised	(38)
Forfeited or expired
Outstanding, ending balance	942	980
Exercisable	552
Weighted Average Exercise Price
Outstanding, beginning balance	$ 11.29
Granted
Exercised	1.80
Forfeited or expired
Outstanding, ending balance	11.67	$ 11.29
Exercisable	$ 7.93
Weighted average remaining contractual life, Outstanding	5 years 10 months 24 days	5 years 10 months 24 days
Weighted average remaining contractual life, Exercisable	4 years 1 month 6 days
Aggregate intrinsic value, Outstanding	$ 11,056
Aggregate intrinsic value, Exercisable	$ 8,539