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Note 9 - Benefit Plans (Details Textual) - USD ($)
2 Months Ended 3 Months Ended
Mar. 19, 2020
Feb. 29, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)     0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     $ 0   $ 168,225
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value     0   $ 130,200
Share Price (in dollars per share)   $ 23.50      
Share-based Payment Arrangement, Expense     $ 84,340 $ 185,762  
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     14,366    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 813,658    
Restricted Stock [Member] | Director [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   5,579      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   1 year      
Restricted Stock or Unit Expense     $ 36,869 $ 28,857  
Restricted Stock [Member] | Officer [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     8,787 9,933  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     3 years 3 years  
Restricted Stock or Unit Expense     $ 47,471 $ 49,023  
Restricted Stock Units (RSUs) [Member] | Officer [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 43,700        
Share Price (in dollars per share) $ 15.62        
Restricted Stock or Unit Expense     $ 0 $ 107,882  
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%