v3.26.1
Note D - Marketable Equity Securities (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Investment Income, Dividend $ 426,000 $ 443,000
Equity Securities, FV-NI, Unrealized Gain (Loss) 1,626,000 1,316,000
Margin Account Borrowings [Member]    
Short-Term Debt $ 0 $ 0