Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Restricted Cash, Noncurrent	$ 0	$ 646
Preferred Stock, Par or Stated Value Per Share	$ 1	$ 1
Preferred Stock, Shares Authorized	977,000	977,000
Preferred Stock, Shares Issued	0	0
Class A Common Stock [Member]
Common Stock, Par or Stated Value Per Share	$ 1	$ 1
Common Stock, Shares Authorized	7,000,000	7,000,000
Common Stock, Shares, Issued	964,001	964,001
Common Stock, Shares, Outstanding	964,001	964,001
Class B Common Stock [Member]
Common Stock, Par or Stated Value Per Share	$ 1	$ 1
Common Stock, Shares Authorized	40,000,000	40,000,000
Common Stock, Shares, Issued	19,035,999	19,035,999
Common Stock, Shares, Outstanding	3,514,809	3,822,601
Treasury Stock, Common, Shares	15,521,190	15,213,398