Note 3 - Securities (Details Textual)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss	$ 1,478,000		$ 1,478,000		$ 620,000
Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss	1,909,000		1,909,000		1,176,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 98,000		$ 98,000		$ 471,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	94		94		42
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 3,088,000		$ 3,088,000		$ 5,184,000
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	166		166		192
Debt Securities, Available-for-Sale, Allowance for Credit Loss	$ 0		$ 0		$ 0
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Amortized Cost, Sold	52,800,000		52,800,000
Debt Securities, Available-for-Sale, Realized Gain (Loss)	(8,000)		(8,000)
Proceeds from Sale of Debt Securities, Available-for-Sale		$ 0	48,641,000	$ 0
Equity Securities, FV-NI	518,000		518,000		268,000
Federal Home Loan Bank Stock	2,508,000		2,508,000		2,255,000
Restricted Investments	$ 2,780,000		2,780,000		2,300,000
Impairment of Investments in Federal Home Loan Bank Stock			$ 0		$ 0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Interest Receivable		Interest Receivable		Interest Receivable
Other Restricted Stock [Member]
Restricted Investments	$ 227,000		$ 227,000
Other Correspondent Banks [Member]
Restricted Investments	45,000		45,000		$ 45,000
Asset Pledged as Collateral [Member]
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss	$ 136,551,000		$ 136,551,000		$ 73,585,000