Note C - Marketable Equity Securities - Recognized Gains (Losses) on Available-for-sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Sales proceeds	$ 711		$ 3,079	$ 279
Cost of securities sold	349		934	368
Realized gain/(loss)	362		2,145	(89)
Realized gain/(loss), net of taxes	$ 222		$ 1,314	$ (55)