Condensed Consolidated Statements of Stockholders' Equity and Redeemable Noncontrolling Interest (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024
Common Class A [Member]
Dividends declared (in dollars per share)	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06
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
Dividends declared (in dollars per share)	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07
Foreign currency translation adjustment, tax expense	$ 0	$ 0	$ 0	$ 3	$ 0	$ 26
Unrealized losses (gain) on interest rate swap cash flow hedge, tax	0	0	0	0	0	0
Change in unfunded SERP liability, tax	8	$ 8	$ 8	(4)	$ (4)	(4)
Unrealized gain on marketable securities arising during the period, tax	$ 0			$ 0		$ 0

Aggregate dividends declared during the period for each share of common stock outstanding.

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