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Note 9 - Benefit Plans (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
Mar. 29, 2017
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 243,769 $ 267,366
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     67,270 452,100
Share Price $ 20.48 $ 23.85    
Share-based Payment Arrangement, Expense     $ 535,731 493,249
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     $ 407,314  
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     $ 97,241 $ 103,926
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     $ 151,437 $ 135,810
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     $ 290,568 $ 253,513
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%