Note 3 - Related Party Transactions (Details) (Immucor Inc [Member], USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Aug. 31, 2011	Nov. 30, 2013	Nov. 30, 2012	May 30, 2013
Immucor Inc [Member]
Note 3 - Related Party Transactions (Details) [Line Items]
Related Party Transaction, Amounts of Transaction			$ 3.0
Investment Advisory, Management and Administrative Fees	0.9	1.1		1.9	2.2
Due to Related Parties	$ 0.9			$ 0.9		$ 0.6