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Note 16 - Employee Benefits (Details Textual) - USD ($)
12 Months Ended
May 10, 2017
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Average Total Shareholder Annual Return, Percentage   10.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Capped Total Shareholder Annual Return, Percentage   125.00%  
Deferred Compensation Share-Based Arrangements, Liability, Current and Noncurrent   $ 758,000 $ 693,000
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Average Total Shareholder Annual Return, Percentage   0.00%  
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Average Total Shareholder Annual Return, Percentage   10.00%  
Restricted Stock [Member]      
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)   36,173 25,414
Share-Based Payment Arrangement, Expense   $ 374,000 $ 307,000
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount   $ 1,600,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 3 days  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 317,000 529,000
Retirement Plan [Member]      
Defined Contribution Plan Employer Voluntary Matching Bank Contribution   66.00%  
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay   6.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   6 years  
Defined Benefit Plan, Plan Assets, Contributions by Employer   $ 641,000 $ 427,000
Retirement Plan [Member] | Middlefield Banking Company [Member]      
Defined Contribution Plan Annual Vesting Percentage     20.00%
Executive Deferred Compensation Plan [Member] | Middlefield Banking Company [Member]      
Deferred Compensation Arrangement with Individual, Recorded Liability   3,800,000 $ 3,700,000
Defined Contribution Plan, Employer Discretionary Contribution Amount   $ 437,000 $ 164,000
The 2017 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 448,000    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year) 10 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)   374,377