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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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