Note J - Earnings Per Share (Details Textual) - shares shares in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	0.1	0.1
Unvested Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	0.7	0.4
Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	1.0	1.0
Series A Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage	5.00%