Note 1 - Basis of Financial Statement Presentation (Details Textual) $ in Millions	3 Months Ended
Mar. 31, 2024 USD ($)
Employee Retention Credit [Member]
Income Tax Credits and Adjustments	$ 0.3
Open-end Mutual Funds [Member]
Number of Funds	16
Exchange-traded Fund [Member]
Number of Funds	1

A credit or adjustment for government or taxing authority authorized decrease in taxes owed as a result of meeting certain tax policy conditions.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

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Balance Type:	debit
Period Type:	duration