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Note C - Marketable Equity Securities (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Available-for-sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 5,803,000   $ 5,310,000
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 235,000    
Accumulated Other Comprehensive Income (Loss), Net of Tax 5,803,000   5,310,000
Available-for-Sale Securities Net Unrealized Holding Gain (Loss), Net of Tax 493,000   1,079,000
Investment Income, Dividend 259,000 $ 218,000  
Trading Securities 0    
Trading Securities, Accumulated Gross Recognized Gain   133,000  
Trading Securities, Accumulated Gross Recognized Loss   0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 5,082,000   5,099,000
Available-for-sale Equity Securities, Gross Unrealized Loss 840,000   1,332,000
Trading Securities Pledged as Collateral 12,347,000   11,949,000
Marketable Securities, Reclassification 0 0  
Available-for-sale Securities, Gross Realized Gains   0  
Available-for-sale Securities, Gross Realized Losses 89,000 $ 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value $ 0   $ 0