Stock-Based Compensation And Stock Repurchases (Summary Of Stock Options Outstanding And Exercisable) (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Stock Options, Granted	0	0
Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Stock Options, Beginning balance	412,779	327,498
Number of Stock Options, Granted	1,264,603	207,657
Number of Stock Options, Forfeited	(205,122)	(122,376)
Number of Stock Options Outstanding, Ending balance	1,472,260	412,779	327,498
Weighted Average Exercise Price of Options Outstanding, Beginning price	$ 14.19	$ 15.87
Weighted Average Exercise Price of Options Outstanding, Granted	1.47	1.92
Weighted Average Exercise Price of Options Outstanding, Ending price	$ 1.66	$ 14.19	$ 15.87
Weighted Average Remaining Years of Contractual Life	9 years 7 months 9 days	1 year 9 months 14 days	1 year 2 months 26 days