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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023
Common Class A [Member] |  |  |  |  |  |
Dividends declared (in dollars per share) | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06
Common Class B [Member] |  |  |  |  |  |
Dividends declared (in dollars per share) | $ 0.07 | $ 0.07 | $ 0.07 | $ 0.07 | $ 0.07 | $ 0.07
Foreign currency translation adjustment, tax expense | $ 3 | $ 0 | $ 26 | $ (13) | $ (105) | $ 9
Unrealized losses on interest rate swap cash flow hedge, tax | 0 |  | 0 | 0 |  | 0
Unrealized holding losses on marketable securities arising during the period, tax | 0 |  | 0 | 0 |  | 0
Change in unfunded SERP liability, tax | $ (4) | $ (4) | $ (4) | $ (4) | $ (4) | $ (4)

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