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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020
Common Class A [Member] |  |  |  |
Dividends declared (in dollars per share) | $ 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
Foreign currency translation adjustment, tax expense | $ (333) | $ 9 | $ (3) | $ (27)
Change in unfunded SERP liability, tax | $ (28) | $ (28) | $ (20) | $ (20)

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