Note 2 - Acquisitions - Preliminary Estimated Fair Values of Assets Acquired and Liabilities Assumed Pending Final Valuation of Intangible Assets (Details) - USD ($)
 3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Advanced Cell Diagnostics (ACD) [Member] | In Process Research and Development [Member]      
Intangible assets:      
Intangible assets $ 107,000,000    
Advanced Cell Diagnostics (ACD) [Member] | Developed Technology Rights [Member]      
Intangible assets:      
Intangible assets 17,000,000    
Advanced Cell Diagnostics (ACD) [Member] | Customer Relationships [Member]      
Intangible assets:      
Intangible assets 77,000,000    
Advanced Cell Diagnostics (ACD) [Member] | Noncompete Agreements [Member]      
Intangible assets:      
Intangible assets 200,000    
Advanced Cell Diagnostics (ACD) [Member]      
Current assets, net of cash 25,196,000    
Equipment 2,757,000    
Other long-term assets 3,812,000    
Intangible assets:      
Goodwill 137,594,000    
Total assets acquired 370,559,000    
Liabilities 3,599,000    
Deferred income taxes, net 78,760,000    
Net assets acquired 288,200,000    
Cash paid, net of cash acquired 250,000,000    
Fair value contingent consideration 38,200,000    
Space [Member] | In Process Research and Development [Member]      
Intangible assets:      
Intangible assets    
Space [Member] | Developed Technology Rights [Member]      
Intangible assets:      
Intangible assets    
Space [Member] | Customer Relationships [Member]      
Intangible assets:      
Intangible assets 6,769,000    
Space [Member] | Noncompete Agreements [Member]      
Intangible assets:      
Intangible assets    
Space [Member]      
Current assets, net of cash 2,128,000    
Equipment 159,000    
Other long-term assets    
Intangible assets:      
Goodwill 3,100,000    
Total assets acquired 12,156,000    
Liabilities 1,884,000    
Deferred income taxes, net 1,708,000    
Net assets acquired 9,004,000    
Cash paid, net of cash acquired 9,004,000    
Fair value contingent consideration    
Zephyrus [Member] | In Process Research and Development [Member]      
Intangible assets:      
Intangible assets 8,300,000    
Zephyrus [Member] | Developed Technology Rights [Member]      
Intangible assets:      
Intangible assets    
Zephyrus [Member] | Customer Relationships [Member]      
Intangible assets:      
Intangible assets    
Zephyrus [Member] | Noncompete Agreements [Member]      
Intangible assets:      
Intangible assets    
Zephyrus [Member]      
Current assets, net of cash 86,000    
Equipment 32,000    
Other long-term assets    
Intangible assets:      
Goodwill 9,378,000    
Total assets acquired 17,796,000    
Liabilities 54,000    
Deferred income taxes, net 2,812,000    
Net assets acquired 14,930,000    
Cash paid, net of cash acquired 8,030,000    
Fair value contingent consideration 6,900,000    
Goodwill 565,789,000   $ 430,882,000
Cash paid, net of cash acquired 259,004,000 $ 82,970,000  
Fair value contingent consideration $ 32,400,000   $ 0