CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parentheticals) - USD ($) $ in Thousands		3 Months Ended
	Jul. 01, 2018	Sep. 30, 2019	Sep. 30, 2018
Reclassification pursuant to adoption of ASU 2016-01, tax (in Dollars)	$ 1,049
Common Class A [Member]
Purchases of shares of Common Stock (class A)		1,400	1,000
Common Stock [Member] | Common Class A [Member]
Balance	13,866,691	13,866,751	13,866,691
Balance		13,866,811	13,866,691
Purchases of shares of Common Stock (class A)		1,400	1,000
Issuance of stock under ESPP shares of Common Stock (class A)		314	628
Number of shares issued as result of stock conversion		60
Common Stock [Member] | Common Class C [Member]
Balance	2,068,857	2,068,797	2,068,857
Balance		2,068,737	2,268,857
Number of shares converted		(60)