Consolidated Balance Sheets (Parentheticals) - shares	Dec. 31, 2023	Dec. 31, 2022
Common Class A [Member]
Common Stock, Shares Authorized (in shares)	10,000,000	10,000,000
Common Stock, Shares, Issued (in shares)	2,832,966	2,791,449
Treasury Stock, issued (in shares)	54,074	47,412
Common Class B [Member]
Common Stock, Shares Authorized (in shares)	2,500,000	2,500,000
Common Stock, Shares, Issued (in shares)	914,283	914,283
Treasury Stock, issued (in shares)	182,435	182,435