Note 9 - Fair Value Measurements - 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	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Collateral dependent loans, fair value	$ 2,084
Commercial Loans [Member]
Collateral dependent loans, fair value	24	$ 24
Agricultural Loans [Member]
Collateral dependent loans, fair value	2,060
Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value	2,084
Fair Value, Inputs, Level 3 [Member] \| Commercial Loans [Member]
Collateral dependent loans, fair value	24	24
Fair Value, Inputs, Level 3 [Member] \| Agricultural Loans [Member]
Collateral dependent loans, fair value	2,060
Fair Value, Inputs, Level 3 [Member] \| Real Estate Loan [Member]
RE – Residential	91	91
Third Party Appraisals [Member] \| Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value	$ 2,084	$ 24
Third Party Appraisals [Member] \| Fair Value, Inputs, Level 3 [Member] \| Measurement Input, Manager Adjustments [Member]
Collateral dependent loans, measurement input
Third Party Appraisals [Member] \| Fair Value, Inputs, Level 3 [Member] \| Measurement Input, Manager Adjustments [Member] \| Weighted Average [Member]
Collateral dependent loans, measurement input
Third Party Appraisals [Member] \| Fair Value, Inputs, Level 3 [Member] \| Commercial Loans [Member]
Collateral dependent loans, fair value	$ 24	$ 24
Third Party Appraisals [Member] \| Fair Value, Inputs, Level 3 [Member] \| Commercial Loans [Member] \| Measurement Input, Manager Adjustments [Member] \| Weighted Average [Member]
Collateral dependent loans, measurement input	0.54	0.53
Third Party Appraisals [Member] \| Fair Value, Inputs, Level 3 [Member] \| Agricultural Loans [Member]
Collateral dependent loans, fair value	$ 2,060	$ 0
Third Party Appraisals [Member] \| Fair Value, Inputs, Level 3 [Member] \| Agricultural Loans [Member] \| Measurement Input, Manager Adjustments [Member] \| Weighted Average [Member]
Collateral dependent loans, measurement input	0.31
Third Party Appraisals [Member] \| Fair Value, Inputs, Level 3 [Member] \| Agricultural Loans [Member] \| Measurement Input, Manager Adjustments [Member] \| Minimum [Member]
Collateral dependent loans, measurement input	0.02
Third Party Appraisals [Member] \| Fair Value, Inputs, Level 3 [Member] \| Agricultural Loans [Member] \| Measurement Input, Manager Adjustments [Member] \| Maximum [Member]
Collateral dependent loans, measurement input	1
Third Party Appraisals [Member] \| Fair Value, Inputs, Level 3 [Member] \| Real Estate Loan [Member]
RE – Residential	$ 91	$ 91
Third Party Appraisals [Member] \| Fair Value, Inputs, Level 3 [Member] \| Real Estate Loan [Member] \| Measurement Input, Manager Adjustments [Member] \| Weighted Average [Member]
RE – Residential	0.60	0.60

Note 9 - Fair Value Measurements - 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

Jun. 30, 2025

USD ($)

Dec. 31, 2024

USD ($)

Collateral dependent loans, fair value

$ 2,084

Commercial Loans [Member]

Collateral dependent loans, fair value

$ 24

Agricultural Loans [Member]

Collateral dependent loans, fair value

2,060