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 |