Note 11 - Stock Compensation - Treasury Stock (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Share repurchase (in shares)	0	0
Treasury Stock, Common [Member]
Share repurchase (in shares)	0	0
Common Class A [Member]
Balance at December 31, 2021 (in shares)	47,412
Balance at December 31, 2022 (in shares)	54,074	47,412
Common Class A [Member] | Treasury Stock, Common [Member]
Balance at December 31, 2021 (in shares)	47,412	41,844
Share repurchase (in shares)	6,662	5,568
Balance at December 31, 2022 (in shares)	54,074	47,412
Common Class B [Member]
Balance at December 31, 2021 (in shares)	182,435
Balance at December 31, 2022 (in shares)	182,435	182,435
Common Class B [Member] | Treasury Stock, Common [Member]
Balance at December 31, 2021 (in shares)	182,435	182,435
Share repurchase (in shares)	0	0
Balance at December 31, 2022 (in shares)	182,435	182,435