Note 4 - Related Party Transactions (Details Textual) - TPG Capital, L.P. [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2015	Nov. 30, 2014	May. 31, 2015
Monitoring Fee [Member]
Related Party Transaction, Amounts of Transaction			$ 3.0
Related Party Transaction, Amounts of Transaction	$ 0.8	$ 1.1	1.6	$ 2.0
Due to Related Parties	$ 0.8		$ 0.8		$ 0.7