Note M - Subsequent Events (Details Textual) - BMO Harris Bank [Member] - Revolving Credit Facility [Member] - USD ($) $ in Millions	Sep. 16, 2024	Jul. 31, 2024
Line of Credit Facility, Maximum Borrowing Capacity		$ 340
Principal Balance Under 300 Million [Member]
Line of Credit Facility, Minimum Required Available Draw Amount	$ 20
Principal Balance At or Over 300 Million [Member]
Line of Credit Facility, Minimum Required Available Draw Amount	50
Subsequent Event [Member]
Line of Credit Facility, Increase In Maximum Borrowing Capacity	(20)
Line of Credit Facility, Maximum Borrowing Capacity	$ 320
Line of Credit Facility, Permitted Borrowing Fee Percentage	0.10%