Note 8 - Shareholders' Equity - Stock Retired and Repurchased (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2017 |
Jun. 30, 2016 |
Jun. 30, 2015 |
|
| Common shares repurchased (in shares) | 357,363 | 697,799 | 645,831 |
| Cost to repurchase common shares | $ 10,246,302 | $ 19,346,104 | $ 16,469,725 |
| Average price per share (in dollars per share) | $ 28.67 | $ 27.72 | $ 25.50 |
| X | ||||||||||
- Definition Total cost of shares repurchased divided by the total number of shares repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of shares that have been repurchased during the period and are being held in treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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