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Note O - Line of Credit and Commercial Letters of Credit (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Letters of Credit Outstanding, Amount $ 0 $ 0
Domestic Line of Credit [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 5,000,000 5,000,000
Long-Term Line of Credit $ 0 $ 0
Domestic Line of Credit [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Debt Instrument, Basis Spread on Variable Rate 0.50%