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Note C - Marketable Equity Securities (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Available-for-sale Securities [Member]          
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 7,077,000   $ 7,077,000   $ 5,310,000
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 297,000 $ 0 532,000 $ 0  
Trading Securities 0   0   0
Trading Securities, Accumulated Gross Recognized Loss   0   0  
Marketable Securities, Reclassification     0 0  
Proceeds from Sale of Available-for-sale Securities, Equity 0 0 279,000 0  
Accumulated Other Comprehensive Income (Loss), Net of Tax 7,077,000   7,077,000   5,310,000
Available-for-Sale Securities Net Unrealized Holding Gain (Loss), Net of Tax     1,767,000   1,079,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0   0   0
Trading Securities, Accumulated Gross Recognized Gain   83,000   83,000  
Available-for-sale Securities Gross Realized Gains (Losses), Cost of Securities Sold     368,000    
Available-for-sale Securities, Gross Realized Losses     89,000    
Available-for-sale Securities Realized Loss, Net of Tax     51,000    
Investment Income, Dividend 243,000 $ 281,000 502,000 $ 404,000  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,649,000   1,649,000   5,099,000
Available-for-sale Equity Securities, Gross Unrealized Loss     225,000   1,332,000
Trading Securities Pledged as Collateral $ 12,104,000   $ 12,104,000   $ 11,949,000