Note 4 - Related Party Transactions (Details Textual) - TPG Capital, L.P. [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016	May 31, 2012	May 31, 2016
Due to Related Parties	$ 0.5		$ 0.5			$ 1.7
General and Administrative Expense [Member]
Related Party Transaction, Expenses from Transactions with Related Party	$ 0.8	$ 0.8	$ 2.4	$ 2.4
Annual Monitoring Fee [Member]
Related Party Transaction, Amounts of Transaction					$ 3.0