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Note 3 - Other Investments (Details Textual) - Sirona Genomics Inc. [Member] - USD ($)
$ in Millions
6 Months Ended
Oct. 03, 2014
Nov. 30, 2015
Dec. 02, 2015
Warrant [Member] | Other Assets [Member]      
Payments for Derivative Instrument, Investing Activities $ 0.7 $ 0.7  
Other Assets [Member]      
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 100.00%    
Loans Receivable, Net $ 7.7 7.7  
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount   $ 12.0  
Maximum [Member]      
Variable Interest Entity, Financial or Other Support, Amount $ 3.6    
Subsequent Event [Member]      
Loans Receivable, Net     $ 1.0
Variable Interest Entity, Arrangements Term 2 years