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Consolidated Statements of Stockholders' Equity (Parentheticals) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Common Class A [Member] |  |
Dividends declared (in dollars per share) | $ 0.24 | $ 0.24
Common Class B [Member] |  |
Dividends declared (in dollars per share) | $ 0.28 | $ 0.28
Foreign currency translation adjustment, tax expense | $ 8 | $ 9
Change in unfunded SERP liability, tax | $ 738 | $ (422)

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