Stock-Based Compensation and Stock Repurchases (Summary Of Stock Options Outstanding And Exercisable) (Details) - Class A [Member] - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Stock Options, Beginning balance	1,707,412	412,779
Number of Stock Options, Granted		1,499,755
Number of Stock Options, Forfeited		(205,122)
Number of Stock Options Outstanding, Ending balance	1,707,412	1,707,412	412,779
Weighted Average Exercise Price of Options Outstanding, Beginning price	$ 1.63	$ 14.19
Weighted Average Exercise Price of Options Outstanding, Granted		1.49
Weighted Average Exercise Price of Options Outstanding, Ending price	$ 1.54	$ 1.63	$ 14.19
Weighted Average Remaining Years of Contractual Life	9 years 2 months 8 days	9 years 5 months 8 days	1 year 9 months 14 days