Note 18 - Subsequent Events (Details Textual) - Subsequent Event [Member] - USD ($) $ / shares in Units, $ in Millions	Nov. 13, 2023	Oct. 26, 2023
Acquisition of CCM Small/Mid-Cap Impact Value Fund Assets [Member]
Assets under Management, Carrying Amount	$ 12.0
Asset Acquisition, Consideration Transferred	$ 0.2
Dividend Declared [Member]
Dividends Payable, Amount Per Share (in dollars per share)		$ 0.1375

Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer.

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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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