Note 11 - Long-Term Incentive and Employee Compensation - Award Activity (Details) - shares shares in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2023
Awards granted (in shares)	2.4	116.4
Restricted Stock [Member]
Awards granted (in shares)	2.3	62.4
Mutual Fund Awards [Member]
Awards granted (in shares)	0.1	54.0

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration