Note 16 - Segment and Geographic Information (Tables)

3 Months Ended

Aug. 31, 2015

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Three Months Ended
	August 31
	2015		2014
Net sales by product group:
Transfusion	$	81,156		86,369
Transplant & Molecular		15,556		16,072
Total	$	96,712		102,441

Revenue from External Customers by Products and Services [Table Text Block]

	Three Months Ended
	August 31
	2015		2014
Net sales to customers by geography are as follows:
United States	$	61,422		62,379
Europe (A)		17,787		21,447
Canada		3,899		4,891
Other		13,604		13,724
Total	$	96,712		102,441

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

	As of
	August 31, 2015		May 31, 2015
Long-lived assets (excluding goodwill and intangibles) by geography:
United States	$	52,737		52,764
Europe (B)		14,527		14,542
Canada		3,700		4,029
Other (C)		2,376		2,239
Total	$	73,340		73,574

	As of
	August 31, 2015		May 31, 2015
Concentration of net assets by geography:
United States	$	233,419	$	241,522
Europe		103,265		100,071
Canada		28,808		30,274
Other (C)		11,944		11,814
Total	$	377,436		383,681