Note 11 - Fair Value (Details) - Contingent Consideration Liability (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
Feb. 28, 2014	Feb. 28, 2013	May 31, 2013
Contingent Consideration Liability [Abstract]
Balance at the beginning of the period	$ (4,504)
Additions due to acquisitions			(4,400)
Change in fair value	4,638	0
Accretion of fair value	(134)		(104)
Balance at the end of the period			$ (4,504)

The increase during the period of contingent consideration liabilities related to business combinations.

No definition available.

Name:	blud_BusinessCombinationContingentConsiderationLiabilityAdditionsDueToAcquisitions
Namespace Prefix:	blud_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Details

Name:	blud_ContingentConsiderationLiabilityAbstract
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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

Interest expense on a contingent liability related to a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	blud_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460

+ Details

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 35

-Paragraph 1

-Subparagraph b

-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 25

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

+ Details

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Balance Type:	credit
Period Type:	instant