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Note C - Marketable Equity Securities (Details) - Cost, Market Value and Unrealized Gain/(Loss) on Equity Securities (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Available-for-sale securities    
Fair market value $ 22,615 $ 20,810
Cost 10,860 10,881
Unrealized gain 11,755 9,929
Trading securities    
Fair market value 214 165
Cost 157 157
Unrealized gain 57 8
Total    
Fair market value 22,829 20,975
Cost 11,017 11,038
Unrealized gain $ 11,812 $ 9,937