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Note C - Marketable Equity Securities (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Mar. 31, 2013
Note C - Marketable Equity Securities (Details) [Line Items]            
Asset Impairment Charges $ 3,000 $ 44,000 $ 27,000 $ 44,000    
Accumulated Other Comprehensive Income (Loss), Net of Tax 5,260,000   5,260,000   4,235,000 5,286,000
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax     1,046,000   459,000  
Trading Securities, Realized Loss     6,000 13,000    
Borrowings Under Margin Account [Member]
           
Note C - Marketable Equity Securities (Details) [Line Items]            
Trading Securities Pledged as Collateral $ 10,382,000   $ 10,382,000   $ 10,771,000