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Note C - Marketable Equity Securities (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Mar. 31, 2015
Note C - Marketable Equity Securities (Details) [Line Items]            
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities   $ 1,000   $ 1,000    
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 6,559,000   $ 6,559,000   $ 6,402,000 $ 6,464,000
Available For Sale Securities Net Unrealized Holding Gain Loss Net Of Tax     157,000   237,000  
Investment Income, Dividend 281,000 215,000        
Trading Securities, Accumulated Gross Recognized Gain 83,000 57,000 83,000 57,000    
Trading Securities, Accumulated Gross Recognized Loss 0 $ 0 0 0    
Proceeds from Sale of Available-for-sale Securities     0 0    
Marketable Securities, Reclassification     0 $ 0    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0   0   0  
Trading Securities Pledged as Collateral 13,670,000   13,670,000   11,723,000  
Available-for-sale Securities [Member]            
Note C - Marketable Equity Securities (Details) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 6,559,000   $ 6,559,000   $ 6,402,000