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Note 2 - Business Combinations (Details Textual)
$ in Thousands
3 Months Ended
Feb. 29, 2016
USD ($)
Aug. 03, 2015
USD ($)
Oct. 01, 2014
USD ($)
Aug. 01, 2014
USD ($)
Nov. 30, 2014
USD ($)
Aug. 31, 2014
USD ($)
May. 31, 2015
USD ($)
May. 31, 2014
USD ($)
LIFECODES [Member]                
Payments to Acquire Businesses, Gross         $ 200 $ 200    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 200              
Business Combination, Contingent Consideration Arrangements, Potential Earn-out Period       2 years        
Business Combination, Consideration Transferred       $ 400        
Reference Lab [Member]                
Payments to Acquire Businesses, Gross   $ 800            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   300            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   200            
Goodwill   $ 300            
Sentilus [Member] | Regulatory Milestones [Member] | Arrangement 2 [Member]                
Business Combination, Contingent Consideration Arrangements, Performance Based Payments, Period     20 years          
Sentilus [Member] | Regulatory Milestones [Member]                
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     $ 4,000          
Sentilus [Member] | Future Sales Targets [Member] | Arrangement 1 [Member]                
Business Combination, Contingent Consideration Arrangements, Potential Earn-out Period     3 years          
Sentilus [Member]                
Payments to Acquire Businesses, Gross 6,000   $ 6,000          
Goodwill 100   $ 600          
Business Combination, Number of Contingent Consideration Arrangements     2          
Business Combination, Contingent Consideration, Liability 7,200   $ 6,300          
Business Combination, Consideration Transferred     12,300          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 18,800   18,800          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent 7,200   $ 7,200          
Goodwill 840,841           $ 842,258 $ 851,563
Business Combination, Contingent Consideration, Liability $ 19,409           $ 18,596 $ 11,300