Note L - Convertible Senior Notes - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Amortization of debt issuance costs	$ 902	$ 865	$ 900
The 5% Convertible Senior Notes Due 2024 [Member]
Contractual interest expense	4,025	4,025
Amortization of debt issuance costs	826	826
Total interest cost	$ 4,851	$ 4,851
Effective interest rate	5.10%	5.10%