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Note J - Securities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Inputs, Level 1 [Member]    
Marketable equity securities $ 27,381,000  
Fair Value, Inputs, Level 2 [Member]    
Marketable equity securities 0  
Fair Value, Inputs, Level 3 [Member]    
Marketable equity securities 0  
Marketable equity securities $ 27,381,000 $ 24,575,000