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Note 4 - Investment Securities (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Proceeds from Sale of Debt Securities, Available-for-Sale $ 0 $ 0 $ 0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss 962,000 810,000  
Debt Securities, Held-to-Maturity, Allowance for Credit Loss 0 0  
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss 28,729,000 31,261,000  
Commercial Paper [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss 16,000 [1] 16,000 [2]  
Debt Securities, Available-for-sale, Recorded Value Equal to Fair Value 19,900,000 9,900,000  
Residential Mortgage-Backed Securities and Residential Collateralized Mortgage Obligations [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss $ 18,100,000    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss to Total Accumulated Loss, Percent 62.80%    
Corporate Debt Securities [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss $ 4,100,000    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss to Total Accumulated Loss, Percent 14.30%    
Municipal Bonds [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss $ 3,100,000    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss to Total Accumulated Loss, Percent 10.90%    
Commercial Collateralized Mortgage Obligations [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss $ 2,700,000    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss to Total Accumulated Loss, Percent 9.30%    
US Government Agencies Debt Securities and SBA Securities [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss $ 760,000    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss to Total Accumulated Loss, Percent 2.60%    
Asset Pledged as Collateral [Member]      
Financial Instruments, Owned, at Fair Value $ 95,200,000    
Asset Pledged as Collateral [Member] | Deposits [Member]      
Financial Instruments, Owned, at Fair Value $ 61,000 $ 76,000  
[1] The Company held $19.9 million of commercial paper where the recorded value and fair value are equal as of December 31, 2023.
[2] The Company held $9.9 million of commercial paper where the recorded value and fair value are equal as of December 31, 2022.