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Note C - Marketable Equity Securities (Details) - Approximate Gross Unrealized Losses and Fair Value of Securities in a Loss Position (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Note C - Marketable Equity Securities (Details) - Approximate Gross Unrealized Losses and Fair Value of Securities in a Loss Position [Line Items]    
Equity securities – Available-for-sale $ 88 $ 133
Equity securities – Trading 151 132
Equity securities – Trading 6 26
Totals 18,947 17,320
Totals 94 159
Continuous Unrealized Loss Position, Less than 12 Months [Member]
    
Note C - Marketable Equity Securities (Details) - Approximate Gross Unrealized Losses and Fair Value of Securities in a Loss Position [Line Items]    
Equity securities – Available-for-sale 1,350 1,567
Equity securities – Trading 84 129
Totals $ 1,434 $ 1,696