Note H - Components of Net Periodic Benefit Cost (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Qualified Pension Plan [Member]
Defined Benefit Plan, Minimum Employer Contributions, Fiscal Year	$ 0.4
Restoration Pension Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0.4	$ 0.5