Note D - Marketable Securities - Details of Marketable Securities (Details) - Iron Net [Member] - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Fair value	$ 25
Basis	33
Cumulative unrealized (loss) gain	(8)
Equity Funds And Other Securities [Member]
Fair value	25	$ 16,539
Basis	33	17,024
Cumulative unrealized (loss) gain	$ (8)	(485)
Common Stock [Member]
Fair value		46
Basis		4,273
Cumulative unrealized (loss) gain		$ (4,227)
Distribution of shares by sponsor (in shares)		198,750