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Note 1 - Principles of Consolidation and Basis of Presentation (Details Textual) $ / shares in Units, $ in Millions			3 Months Ended
	Aug. 28, 2023 $ / shares shares	Jul. 25, 2020	Sep. 30, 2023 USD ($) $ / shares shares	May 16, 2023 shares	May 15, 2023 shares	Dec. 31, 2022 $ / shares shares
Common Stock, Par or Stated Value Per Share | $ / shares			$ 0.01			$ 0.01
Common Class A [Member]
Additional Share Issued for Every Two Shares of Common Stock	1
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.01
Common Stock, Shares Authorized			105,000,000	105,000,000	60,000,000	105,000,000
Treasury Stock, Shares, Retired			3,052,899
Common Class B [Member]
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.01
Common Stock, Shares Authorized			35,000,000	35,000,000	20,000,000	35,000,000
Treasury Stock, Shares, Retired			1,445,515
Stock Split From [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio		3
Stock Split To [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio		2
Deposits for Restrictions Related to Captive Insurance Company [Member]
Restricted Cash and Cash Equivalents, Current | $			$ 2.3

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- Definition

The additional share issued for every two shares of common stock.

+ References

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Number of shares of common and preferred stock retired from treasury during the period.

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