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Note 14 - Shareholders' Equity - Stock Retired and Repurchased (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Treasury Stock, Shares, Acquired (in shares) | 1,538,363 |  |
Treasury Stock, Value, Acquired, Cost Method | $ 24,319,000 | $ 0 |
Share Repurchase Program [Member] |  |  |
Treasury Stock, Shares, Acquired (in shares) | 1,538,363 |  | 950,484
Treasury Stock, Value, Acquired, Cost Method | $ 24,319,044 |  | $ 22,019,381
Average price per share (in dollars per share) | $ 15.81 |  | $ 23.17

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