Note 7 - Fair Value - Quantitative Information for Financial Instruments on Non-recurring Basis (Details) - One-to-Four Family Residential Real Estate [Member] - Fair Value, Nonrecurring [Member] $ in Thousands	Dec. 31, 2023 USD ($)
Other foreclosed assets	$ 387
Fair Value, Inputs, Level 3 [Member]
Other real estate owned	405
Other foreclosed assets	$ 387
Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member]
Other real estate owned, input	0.10
Other foreclosed assets, input	0.062