Note 8 - Fair Value - Nonrecurring Measurements Valuation Techniques (Details)	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Commercial Real Estate Portfolio Segment [Member] \| Valuation, Income Approach [Member]
Loans, fair value	$ 13,279,000	$ 7,286
Commercial Real Estate Portfolio Segment [Member] \| Valuation, Income Approach [Member] \| Minimum [Member] \| Measurement Input, Cap Rate [Member]
Loans, measurement input	(0.5404)	(0.5603)
Commercial Real Estate Portfolio Segment [Member] \| Valuation, Income Approach [Member] \| Maximum [Member] \| Measurement Input, Cap Rate [Member]
Loans, measurement input	0.6436	0.6902
Commercial Real Estate Portfolio Segment [Member] \| Valuation, Income Approach [Member] \| Weighted Average [Member] \| Measurement Input, Cap Rate [Member]
Loans, measurement input	(0.4203)	(0.4071)
Commercial Portfolio Segment [Member] \| Valuation, Market Approach [Member]
Loans, fair value	$ 2,170,000
Commercial Portfolio Segment [Member] \| Valuation, Market Approach [Member] \| Measurement Input, Price Volatility [Member]
Loans, measurement input	0.1271
Commercial Portfolio Segment [Member] \| Valuation Technique, Consensus Pricing Model [Member]
Loans, fair value		$ 2,418
Commercial Portfolio Segment [Member] \| Valuation Technique, Consensus Pricing Model [Member] \| Measurement Input, Cap Rate [Member]
Loans, measurement input		6.67
Residential Portfolio Segment [Member] \| Valuation, Market Approach [Member]
Loans, fair value	$ 535,000	$ 1,132
Residential Portfolio Segment [Member] \| Valuation, Market Approach [Member] \| Minimum [Member] \| Measurement Input, Cap Rate [Member]
Loans, measurement input	(0.191)	(0.0891)
Residential Portfolio Segment [Member] \| Valuation, Market Approach [Member] \| Maximum [Member] \| Measurement Input, Cap Rate [Member]
Loans, measurement input	0.1304	(0.0622)
Residential Portfolio Segment [Member] \| Valuation, Market Approach [Member] \| Weighted Average [Member] \| Measurement Input, Cap Rate [Member]
Loans, measurement input	0.0362	(0.0716)