Note 8 - Share-based Compensation  | 
6 Months Ended | 
|---|---|
Dec. 31, 2016  | |
| Notes to Financial Statements | |
| Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | 
 Note  8.  Share-based Compensation:During the  
six  months ended  December  31,  2016  and 2015,  the Company granted 1.1  million and 777,000  stock options at weighted average grant prices of $107.40  and $105.67  and weighted average fair values of $18.13  and $18.59,  respectively. During the six  months ended  December  31,  2016  and 2015,  the Company granted 64,931  and 35,000  restricted stock units at a weighted average fair value of $109.36  and $105.01,  respectively. During the six  months ended  December  31,  2016  and 2015,  the Company granted 23,965  and 19,994  shares of restricted stock at grant date fair values of $104.94  and $99.53,  respectively. 
Stock options for  23,145  and 13,000  shares of common stock with total intrinsic values of $1.0  million and $0.5  million were exercised during the six  months ended  December  31,  2016  and 2015,  respectively. Stock-based compensation expense of  $4.1  million and $2.3  million was included in selling, general and administrative expenses for the three  months ended  December  31,  2016  and 2015,  respectively. Stock-based compensation expense of $7.2  million and $4.4  million was included in selling, general and administrative expenses for the six  months ended  December  31,  2016  and 2015,  respectively. As of  December  31,  2016,  there was $33.0  million of unrecognized compensation cost related to non-vested stock options, non-vested restricted stock units and non-vested restricted stock. The weighted average period over which the compensation cost is expected to be recognized is 2.7  years. |