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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parentheticals) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jul. 01, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 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)		2,000	11,000	3,400	12,000
Common Stock [Member] | Common Class A [Member]
Balance	13,866,691	13,866,691	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)		2,000	11,000	3,400	12,000
Issuance of stock under ESPP shares of Common Stock (class A)		419	863	733	1,491
Number of shares issued as result of stock conversion				60
Common Stock [Member] | Common Class C [Member]
Balance	2,068,857	2,068,857	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)

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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