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Note 8 - Employee Benefit Plans (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 100.00%  
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 402 $ 394
Age Attained to be Eligible for ESOP (Year) 21 years  
Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP $ 360 300
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares (in shares) 184,054  
Age of Employees Required to Diversify Allocated ESOP Shares (Year) 55 years  
Years of Plan Participation Required to Diversify Allocated ESOP Shares (Year) 10 years  
Percentage of Allocated ESOP Shares That Can be Diversified 50.00%  
Accrued Expenses for Salary Continuation Plan $ 296 $ 304
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Due to Demographic Changes (764)  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Due to Change in Mortality Table (40)  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Due to Change in Discount Rate $ 1,590  
Equity Securities [Member]    
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 65.00%  
Fixed Income Securities [Member]    
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 35.00%  
Hedge Funds [Member]    
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 0.00%