Note 11 - Stock Compensation - Treasury Stock (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Common Class A [Member]
Balance (in shares)	41,844
Balance (in shares)	47,412	41,844
Common Class A [Member] | Treasury Stock [Member]
Balance (in shares)	41,844	39,467
Share repurchase (in shares)	5,568	2,377
Balance (in shares)	47,412	41,844
Common Class B [Member]
Balance (in shares)	182,435
Balance (in shares)	182,435	182,435
Common Class B [Member] | Treasury Stock [Member]
Balance (in shares)	182,435	182,435
Share repurchase (in shares)	0	0
Balance (in shares)	182,435	182,435