CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parentheticals) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 01, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Common Class A [Member]
Purchases of shares of Common Stock (class A)		69,420	8,075	72,820	20,075
Common Stock [Member] | Common Class A [Member]
Balance	13,866,691	13,866,811	13,866,691	13,866,751	13,866,691
Balance		13,866,811	13,866,691	13,866,811	13,866,691
Purchases of shares of Common Stock (class A)		69,420	8,075	72,820	20,075
Issuance of stock under ESPP shares of Common Stock (class A)		553	505	1,286	1,966
Number of shares issued as result of stock conversion				60
Common Stock [Member] | Common Class C [Member]
Balance	2,068,857	2,068,737	2,068,857	2,068,797	2,068,857
Balance		2,068,737	2,068,857	2,068,737	2,068,857
Number of shares converted				(60)
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accounting Standards Update 2016-01 [Member]
Reclassification pursuant to adoption of ASU 2016-01, tax (in Dollars)	$ 1,049