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Note 9 - Benefit Plans (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Share Price (in dollars per share) $ 18.79     $ 15.40
Officer [Member]        
Restricted Stock or Unit Expense   $ 75,904 $ 47,471  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   20,126    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 677,220    
Restricted Stock [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 6,979      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 1 year      
Restricted Stock Units (RSUs) [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   13,147 8,787  
Restricted Stock or Unit Expense   $ 33,000 $ 36,869  
Restricted Stock Units (RSUs) [Member] | Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years 3 years  
Restricted Stock or Unit Expense   $ 12,573 $ 0  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   0    
Performance Shares [Member] | Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       53,075
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Incentive Award Level, Threshold, Percentage       25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Incentive Award Level, Target, Percentage       50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Incentive Award Level, Percentage       100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Incentive Award Level, Weight, Total Assets, Percentage       50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Incentive Award Level, Weight, Return on Average Assets, Percentage       50.00%
Restricted Stock Awards, Restricted Stock Units and Stock Options [Member]        
Share-based Payment Arrangement, Expense   $ 121,477 $ 84,340