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Note 6 - Borrowings (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Apr. 01, 2026
May 20, 2022
Mar. 25, 2021
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Oct. 31, 2023
Federal Home Loan Bank, Advances, Maximum Available Credit to Bank Assets, Percentage         25.00%      
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds         $ 181,600,000   $ 204,400,000  
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged         835,300,000   871,300,000  
Letters of Credit Outstanding, Amount         60,000,000      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]     Secured Overnight Financing Rate (SOFR) [Member]          
Gain (Loss) on Extinguishment of Debt         (0) $ 905,000    
Proceeds from Equity Method Investment, Distribution, Return of Capital         187,000 179,000    
Line of Credit Facility, Remaining Borrowing Capacity             1,500,000  
NexBank [Member] | Revolving Credit Facility [Member]                
Proceeds from Equity Method Investment, Distribution, Return of Capital   $ 15,000,000            
Line of Credit Facility, Remaining Borrowing Capacity         1,500,000      
Pacific Coast Bankers Bank [Member] | Fed Funds Borrowing Facility [Member]                
Line of Credit Facility, Remaining Borrowing Capacity         50,000,000   50,000,000  
Line of Credit Facility, Maximum Borrowing Capacity               $ 50,000,000
Debt Instrument, Minimum Average Demand Deposit Account Balance               $ 250,000
Debt Instrument, Notes Due 2031 [Member]                
Subordinated Debt, Ending Balance     $ 40,000,000          
Debt Instrument, Interest Rate, Stated Percentage     3.75%          
Proceeds from Issuance of Subordinated Long-Term Debt     $ 39,300,000          
Debt Instrument, Repurchased Face Amount       $ 5,000,000   $ 5,000,000    
Gain (Loss) on Extinguishment of Debt       $ 905,000        
Debt Instrument, Notes Due 2031 [Member] | Forecast [Member]                
Debt Instrument, Basis Spread on Variable Rate 3.00%              
Federal Home Loan Bank of San Francisco [Member]                
Federal Reserve Bank Advances, Available Amount         16,900,000   17,300,000  
Bellevue Washington Branch [Member]                
Letters of Credit Outstanding, Amount             772,000  
Securities Investment [Member] | Federal Home Loan Bank of San Francisco [Member]                
Federal Reserve Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged         $ 17,600,000   $ 18,000,000