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Note 9 - Benefit Plans (Details Textual) - USD ($)
1 Months Ended 6 Months Ended
Mar. 29, 2017
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 168,225 $ 267,366
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     136,275 462,900
Share Price $ 20.48 $ 23.85    
Share-based Payment Arrangement, Expense     $ 384,058 334,135
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     $ 606,248  
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     $ 63,039 $ 69,652
Restricted Stock [Member] | Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     9,932 6,986
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years 3 years
Restricted Stock or Unit Expense     $ 105,255 $ 95,475
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     $ 215,764 $ 169,008
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%