Note 6 - Investment and Equity Securities (Details Textual)		3 Months Ended
		Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss		$ 1,500,000		$ 1,500,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions		23
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions		177
Equity Securities, FV-NI, Current		$ 1,021,000		$ 855,000
Equity Securities, FV-NI, Unrealized Gain (Loss)	[1]	$ (34,000)	$ (52,000)
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]		Interest Receivable and Other Assets		Interest Receivable and Other Assets
Asset Pledged as Collateral [Member] | Deposits [Member]
Financial Instruments, Owned, at Fair Value		$ 111,000,000		$ 112,100,000

[1] Not within scope of ASC 606