Consolidated Statements of Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Employees [Member] Preferred Stock [Member]	Employees [Member] Common Stock [Member] Common Class A [Member]	Employees [Member] Common Stock [Member] Common Class B [Member]	Employees [Member] Additional Paid-in Capital [Member]	Employees [Member] Treasury Stock, Common [Member]	Employees [Member] AOCI Attributable to Parent [Member]	Employees [Member] Retained Earnings [Member]	Employees [Member] Noncontrolling Interest Before Receivable For Issuance Of Capital Stock [Member]	Employees [Member] Noncontrolling Interest, Receivables from Issuance of Equity [Member]	Employees [Member]	Stock Repurchase Program [Member] Preferred Stock [Member]	Stock Repurchase Program [Member] Common Stock [Member] Common Class A [Member]	Stock Repurchase Program [Member] Common Stock [Member] Common Class B [Member]	Stock Repurchase Program [Member] Additional Paid-in Capital [Member]	Stock Repurchase Program [Member] Treasury Stock, Common [Member]	Stock Repurchase Program [Member] AOCI Attributable to Parent [Member]	Stock Repurchase Program [Member] Retained Earnings [Member]	Stock Repurchase Program [Member] Noncontrolling Interest Before Receivable For Issuance Of Capital Stock [Member]	Stock Repurchase Program [Member] Noncontrolling Interest, Receivables from Issuance of Equity [Member]	Stock Repurchase Program [Member]	Preferred Stock [Member]	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member]	Additional Paid-in Capital [Member]	Treasury Stock, Common [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Noncontrolling Interest Before Receivable For Issuance Of Capital Stock [Member]	Noncontrolling Interest, Receivables from Issuance of Equity [Member]	Common Class B [Member]	Total
BALANCE (in shares) at Dec. 31, 2023																					0	1,574	28,765
BALANCE at Dec. 31, 2023																					$ 0	$ 16	$ 288	$ 156,101	$ (22,661)	$ 3,299	$ 60,196	$ (12,731)			$ 184,508
Dividends on common stock ($0.075 per share)																					$ 0	$ 0	$ 0	0	0		(2,121)				(2,121)
Stock-based compensation (in shares)																					0	0	14
Stock-based compensation																					$ 0	$ 0	$ 0	749	0		0				749
Repurchase of Class B common stock	$ 0	$ 0	$ 0	$ 0	$ (2,523)		$ 0			$ (2,523)	$ 0	$ 0	$ 0	$ 0	$ (4,101)		$ 0			$ (4,101)
Other comprehensive income																					0	0	0	0	0	(5,210)	0	128			(5,082)
Net income (loss)																					$ 0	$ 0	$ 0	0	0	0	8,123	46			8,169
BALANCE (in shares) at Mar. 31, 2024																					0	1,574	28,905
BALANCE at Mar. 31, 2024																					$ 0	$ 16	$ 289	157,549	(29,285)	(1,911)	66,198	(13,441)			179,415
Exercise of stock options (in shares)																					0	0	126
Exercise of stock options																					$ 0	$ 0	$ 1	1,015	0		0				1,016
Purchase of equity of subsidiary																					$ 0	$ 0	$ 0	(316)	0		0	(884)			(1,200)
BALANCE (in shares) at Dec. 31, 2023																					0	1,574	28,765
BALANCE at Dec. 31, 2023																					$ 0	$ 16	$ 288	156,101	(22,661)	3,299	60,196	(12,731)			184,508
Net income (loss)																															17,525
BALANCE (in shares) at Jun. 30, 2024																					0	1,574	28,906
BALANCE at Jun. 30, 2024																					$ 0	$ 16	$ 289	158,007	(31,849)	1,836	73,779	(12,524)			189,554
BALANCE (in shares) at Dec. 31, 2023																					0	1,574	28,765
BALANCE at Dec. 31, 2023																					$ 0	$ 16	$ 288	156,101	(22,661)	3,299	60,196	(12,731)			184,508
Repurchase of Class B common stock																														$ (37,500)
BALANCE (in shares) at Dec. 31, 2024																					0	1,574	29,310
BALANCE at Dec. 31, 2024																					$ 0	$ 16	$ 293	159,192	(37,486)	3,919	64,574	(10,174)	$ (783)		179,551
BALANCE (in shares) at Mar. 31, 2024																					0	1,574	28,905
BALANCE at Mar. 31, 2024																					$ 0	$ 16	$ 289	157,549	(29,285)	(1,911)	66,198	(13,441)			179,415
Dividends on common stock ($0.075 per share)																					$ 0	$ 0	$ 0	0	0		(2,031)				(2,031)
Stock-based compensation (in shares)																					0	0	1
Stock-based compensation																					$ 0	$ 0	$ 0	458	0		0				458
Repurchase of Class B common stock	0	0	0	0	(768)		0			(768)	0	0	0	0	(1,796)		0			(1,796)
Other comprehensive income																					0	0	0	0	0	3,759	0	(113)			3,646
Net income (loss)																					$ 0	$ 0	$ 0	0	0	0	9,612	(256)			9,356
BALANCE (in shares) at Jun. 30, 2024																					0	1,574	28,906
BALANCE at Jun. 30, 2024																					$ 0	$ 16	$ 289	158,007	(31,849)	1,836	73,779	(12,524)			189,554
Exercise of stock options (in shares)																					0	0	0
Exercise of stock options																					$ 0	$ 0	$ 0	0	0		0				1,286
Purchase of equity of subsidiary																					$ 0	$ 0	$ 0	0	0		0	0			(12)
BALANCE (in shares) at Dec. 31, 2024																					0	1,574	29,310
BALANCE at Dec. 31, 2024																					$ 0	$ 16	$ 293	159,192	(37,486)	3,919	64,574	(10,174)	(783)		179,551
Dividends on common stock ($0.075 per share)																					$ 0	$ 0	$ 0	0	0	0	(2,026)	0	0		(2,026)
Stock-based compensation (in shares)																					0	0	14
Stock-based compensation																					$ 0	$ 0	$ 0	739	0	0	0	0	0		739
Repurchase of Class B common stock	0	0	0	0	(462)	$ 0	0	$ 0	$ 0	(462)	0	0	0	0	(1,887)	$ 0	0	$ 0	$ 0	(1,887)
Restricted Class B common stock issued to a member of the Board of Directors																					0	0	0	50	0	0	0	0	0		50
Other comprehensive income																					0	0	0	0	0	454	0	670	0		1,124
Net income (loss)																					$ 0	$ 0	$ 0	0	0	0	10,630	(329)	0		10,301
BALANCE (in shares) at Mar. 31, 2025																					0	1,574	29,324
BALANCE at Mar. 31, 2025																					$ 0	$ 16	$ 293	159,981	(39,835)	4,373	73,178	(9,833)	(783)		187,390
BALANCE (in shares) at Dec. 31, 2024																					0	1,574	29,310
BALANCE at Dec. 31, 2024																					$ 0	$ 16	$ 293	159,192	(37,486)	3,919	64,574	(10,174)	(783)		179,551
Repurchase of Class B common stock																														$ (42,600)
Net income (loss)																															13,169
BALANCE (in shares) at Jun. 30, 2025																					0	1,574	29,323
BALANCE at Jun. 30, 2025																					$ 0	$ 16	$ 293	160,587	(42,567)	4,720	73,990	(9,342)	(531)		187,166
BALANCE (in shares) at Mar. 31, 2025																					0	1,574	29,324
BALANCE at Mar. 31, 2025																					$ 0	$ 16	$ 293	159,981	(39,835)	4,373	73,178	(9,833)	(783)		187,390
Dividends on common stock ($0.075 per share)																					$ 0	$ 0	$ 0	0	0		(2,010)		0		(2,010)
Stock-based compensation (in shares)																					0	0	(1)
Stock-based compensation																					$ 0	$ 0	$ 0	606	0		0		0		606
Repurchase of Class B common stock	$ 0	$ 0	$ 0	$ 0	$ 0		$ 0		$ 252	$ 0	$ 0	$ 0	$ 0	$ 0	$ (2,732)		$ 0		$ 0	$ (2,732)
Other comprehensive income																					0	0	0	0	0	347	0	698	0		1,045
Net income (loss)																					$ 0	$ 0	$ 0	0	0	0	2,822	45	0		2,867
BALANCE (in shares) at Jun. 30, 2025																					0	1,574	29,323
BALANCE at Jun. 30, 2025																					$ 0	$ 16	$ 293	$ 160,587	$ (42,567)	$ 4,720	$ 73,990	$ (9,342)	$ (531)		$ 187,166
Exercise of stock options (in shares)																															0