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] - Fair Value, Inputs, Level 3 [Member] $ in Thousands	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Agricultural Loans [Member]
RE – Agricultural	$ 576
Real Estate Loan [Member]
RE – Residential	83
Third Party Appraisals [Member] | Agricultural Loans [Member]
RE – Agricultural	$ 576	$ 0
Third Party Appraisals [Member] | Agricultural Loans [Member] | Measurement Input, Manager Adjustments [Member]
RE – Agricultural	32
RE – Agricultural	(32)
Third Party Appraisals [Member] | Agricultural Loans [Member] | Measurement Input, Manager Adjustments [Member] | Weighted Average [Member]
RE – Agricultural	32
RE – Agricultural	(32)
Third Party Appraisals [Member] | Real Estate Loan [Member]
RE – Residential	$ 83	$ 0
Third Party Appraisals [Member] | Real Estate Loan [Member] | Measurement Input, Manager Adjustments [Member]
RE – Residential	8
RE – Residential	(8)
Third Party Appraisals [Member] | Real Estate Loan [Member] | Measurement Input, Manager Adjustments [Member] | Weighted Average [Member]
RE – Residential	8
RE – Residential	(8)