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Note D - Marketable Equity Securities (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Investment Income, Dividend $ 357,000 $ 309,000 $ 666,000 $ 660,000  
Equity Securities, FV-NI, Unrealized Gain (Loss), Total (3,349,000) $ 1,632,000      
Margin Account Borrowings [Member] | Accrued Expenses and Other Liabilities [Member]          
Short-Term Debt, Total $ 640,000   $ 640,000   $ 1,214,000