Note 8 - Loans Receivable, Net (Details Textual)	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 0	$ 0		$ 0
Financing Receivable, Nonaccrual, Interest Income	$ 0
Financing Receivable, Number of Loans Modified	2	2		2
Financing Receivable, Modified, Accumulated	$ 354,000	$ 354,000		$ 385,000
Financing Receivable, Modified in Period, Amount		$ 0	$ 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts	0	0	0
Off-Balance-Sheet, Credit Loss, Liability	$ 173,100,000	$ 173,100,000
Other Liabilities [Member]
Off-Balance-Sheet, Credit Loss, Liability	1,100,000	1,100,000		$ 0
Commercial Portfolio Segment [Member]
Financing Receivable, Nonaccrual, Review Limit	200,000	200,000
Consumer Portfolio Segment [Member]
Financing Receivable, Nonaccrual, Review Limit	$ 100,000	$ 100,000