Note 11 - Fair Value Measurement - Quantitative Information (Details) $ in Thousands	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Servicing rights on sold loans, at fair value	$ 3,220		$ 3,281
Fair Value, Recurring [Member]
Servicing rights on sold loans, at fair value	3,220		3,281
Assets, fair value	306,735		343,892
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Servicing rights on sold loans, at fair value	3,220	$ 3,301	3,281	$ 3,740	$ 3,820	$ 3,793
Assets, fair value	16,418		35,162
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Valuation Technique, Consensus Pricing Model [Member] \| Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Assets, fair value	$ 13,198		$ 31,881
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Valuation Technique, Consensus Pricing Model [Member] \| Measurement Input, Quoted Price [Member] \| Maximum [Member] \| Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Measurement input	100.6		101
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Valuation Technique, Consensus Pricing Model [Member] \| Measurement Input, Quoted Price [Member] \| Minimum [Member] \| Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Measurement input	98.7		99
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Sold Loan Servicing Rights [Member] \| Valuation Technique, Discounted Cash Flow [Member]
Servicing rights on sold loans, at fair value	$ 3,220		$ 3,281
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Sold Loan Servicing Rights [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Weighted Average [Member]
Sold loan servicing rights, measurement input	0.1133		0.1178
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Sold Loan Servicing Rights [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Measurement Input, Constant Prepayment Rate [Member] \| Weighted Average [Member]
Sold loan servicing rights, measurement input	0.0589		0.0685