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Note C - Marketable Equity Securities (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Available-for-sale Securities [Member]          
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 5,381,000   $ 5,381,000   $ 6,402,000
Trading Securities, Accumulated Gross Recognized Loss 0 $ 0 0 $ 0  
Marketable Securities, Reclassification     0 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0   0   0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 579,000   579,000 1,000  
Accumulated Other Comprehensive Income (Loss), Net of Tax 5,381,000   5,381,000   6,402,000
Available-for-Sale Securities Net Unrealized Holding Gain (Loss), Net of Tax     (1,011,000)   237,000
Investment Income, Dividend 288,000 238,000      
Trading Securities, Accumulated Gross Recognized Gain 59,000 $ 89,000 59,000 $ 89,000  
Trading Securities Pledged as Collateral $ 13,280,000   $ 13,280,000   $ 11,723,000