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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parentheticals) - Common Stock [Member] - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Common Class A [Member] |  |  |  |
Balance | 13,866,913 | 13,866,811 | 13,866,913 | 13,866,751
Balance | 13,866,913 | 13,866,811 | 13,866,913 | 13,866,811
Purchases of shares of Common Stock (class A) | 19,900 | 69,420 | 35,996 | 72,820
Issuance of stock under ESPP shares of Common Stock (class A) | 227 | 553 | 802 | 1,286
Number of shares issued as result of stock conversion |  |  |  | 60
Common Class C [Member] |  |  |  |
Balance | 2,068,635 | 2,068,737 | 2,068,635 | 2,068,797
Balance | 2,068,635 | 2,068,737 | 2,068,635 | 2,068,737
Number of shares converted |  |  |  | (60)

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