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Note 1 - Summary of Significant Accounting Policies - Premises and Equipment (Details)	Dec. 31, 2025
Land Improvements [Member] \| Minimum [Member]
Property, plant and equipment, useful life (Year)	3 years
Land Improvements [Member] \| Maximum [Member]
Property, plant and equipment, useful life (Year)	10 years
Building and Building Improvements [Member] \| Minimum [Member]
Property, plant and equipment, useful life (Year)	10 years
Building and Building Improvements [Member] \| Maximum [Member]
Property, plant and equipment, useful life (Year)	40 years
Furniture and Fixtures [Member] \| Minimum [Member]
Property, plant and equipment, useful life (Year)	3 years
Furniture and Fixtures [Member] \| Maximum [Member]
Property, plant and equipment, useful life (Year)	10 years