Note H - Components of Net Periodic Benefit Cost (Details Textual) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Qualified Pension Plan [Member]
Defined Benefit Plan, Minimum Employer Contributions, Fiscal Year	$ 6.0
Restoration Pension Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0.9	$ 0.4