Note 4 - Restrictions on Cash and Due from Banks (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Cash Reserve Deposit Required and Made	$ 0	$ 0
Cash and Securities Segregated under Federal and Other Regulations	$ 25,500	$ 101,000

Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 210
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478482/942-210-50-1

Name:	us-gaap_CashReserveDepositRequiredAndMade
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant