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)