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Note D - Marketable Equity Securities (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2022
Dec. 31, 2022
Investment Income, Dividend $ 362,000   $ 357,000  
Equity Securities, FV-NI, Unrealized Gain (Loss) (165,000) $ (3,349,000)    
Margin Account Borrowings [Member] | Accrued Expenses and Other Liabilities [Member]        
Short-Term Debt $ 739,000     $ 914,000