Note 4 - Fair Value Measurements - Liability Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) - Contingent Consideration [Member] - Fair Value, Inputs, Level 3 [Member] $ in Millions |
12 Months Ended |
|---|---|
|
Jun. 30, 2017
USD ($)
| |
| Fair value at the beginning of period | $ 38.5 |
| Purchase price contingent consideration (Note 2) | 40.0 |
| Payments | (28.5) |
| Change in fair value of contingent consideration | 18.4 |
| Contingent consideration payable | $ 68.4 |