Note 8 - Benefits Plans (Details Textual)	9 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) shares
Employee Stock Ownership Plan (ESOP), Shares in ESOP (in shares) | shares	161,126		75,080
Split-dollar Life Insurance Policies, Initial Cash Outlay	$ 0	$ 0
Supplemental Employee Retirement Plan [Member]
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 129,000		$ 90,000
Defined Benefit Plan, Minimum Age	65
Liability, Defined Benefit Plan	$ 1,601,000		1,521,000
Postemployment Retirement Benefits [Member]
Liability, Defined Benefit Plan	1,435,000		842,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	46,000		5,000
Postretirement Life Insurance [Member]
Cash Surrender Value of Life Insurance	28,070,000		12,966,000
Postretirement Life Insurance [Member] | Director [Member]
Liability, Defined Benefit Plan	$ 100,000
Postretirement Life Insurance [Member] | Executive Officer [Member]
Defined Benefit Plan, Liability, Multiplier of Salary	3
Deferred Compensation, Excluding Share-Based Payments and Retirement Benefits [Member]
Deferred Compensation Arrangement with Individual, Maximum Contractual Term (Year)	10 years
Deferred Compensation Arrangement with Individual, Recorded Liability	$ 884,000		890,000
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 60,000		$ 89,000
Employee Stock Option Plan [Member]
Employee Stock Ownership Plan, Requisite Service Period (Year)	1 year
Employee Stock Ownership Plan, Requisite Service Hours	1,000
Employee Stock Ownership Plan, Minimum Age	21
Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP	$ 0	0
Employee Stock Ownership Plan, Period of Service, Vesting Ratably (Year)	2 years
Employee Stock Ownership Plan, Period of Service, Fully Vested (Year)	6 years
Employee Stock Ownership Plan (ESOP), Shares in ESOP (in shares) | shares	161,126		75,080
Section 401(k) Plan [Member]
Defined Contribution Plan, Requisite Service Period (Year)	1 year
Defined Contribution Plan, Requisite Service Hours	1,000
Defined Contribution Plan, Minimum Age	21
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Defined Contribution Plan, Cost	$ 170,000	127,000
Profit-sharing Employer Contribution Component to the 401(k) Plan [Member]
Defined Contribution Plan, Cost	$ 309,000	$ 235,000
Defined Contribution Plan, Period of Service, Vesting Ratably (Year)	2 years
Defined Contribution Plan, Period of Service, Fully Vested (Year)	6 years