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Note C - Marketable Equity Securities (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]      
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 0 $ 24,000  
Accumulated Other Comprehensive Income (Loss), Net of Tax 6,582,000   6,160,000
Available For Sale Securities Net Unrealized Holding Gain Loss Net Of Tax 410,000   1,897,000
Trading Securities, Realized Gain 52,000 0  
Trading Securities, Realized Loss 0 12,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0   0
Trading Securities Pledged as Collateral $ 9,823,000   $ 10,017,000