Note 3 - Earnings Per Share (Details Textual) - shares shares in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	0.8	1.0
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	1.5	0.5
Series A Redeemable Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	9.1	9.1