Note 9 - Fair Value Measurement - Quantitative Information About Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on a Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Commercial Loans [Member]
Commercial	$ 27	$ 27
Fair Value, Inputs, Level 3 [Member] | Commercial Loans [Member]
Commercial	27	27
Fair Value, Inputs, Level 3 [Member] | Real Estate Loan [Member]
RE – Residential	357	357
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Loans [Member]
Commercial	$ 27	$ 27
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Loans [Member] | Measurement Input, Manager Adjustments [Member] | Weighted Average [Member]
Commercial	48	(48)
Commercial	(48)	48
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate Loan [Member]
RE – Residential	$ 357	$ 357
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate Loan [Member] | Measurement Input, Manager Adjustments [Member] | Weighted Average [Member]
RE – Residential	11	11