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Note 9 - Benefit Plans (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Mar. 29, 2017
Mar. 31, 2019
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 168,225 $ 79,130
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value   $ 130,200 $ 130,200 625,260
Share Price $ 20.48 $ 23.85 $ 23.85  
Share-based Payment Arrangement, Expense     $ 185,762 172,901
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     15,434  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 799,001 $ 799,001  
Restricted Stock [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   5,502    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year    
Restricted Stock or Unit Expense     $ 28,857 $ 34,649
Restricted Stock [Member] | Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     9,933 6,986
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years 3 years
Restricted Stock or Unit Expense     $ 49,023 $ 53,748
Restricted Stock Units (RSUs) [Member] | Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 55,823      
Restricted Stock or Unit Expense     $ 107,882 $ 84,504
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%