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Note 8 - Benefit Plans (Details Textual) - USD ($)
1 Months Ended 6 Months Ended
Mar. 29, 2017
Feb. 28, 2018
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 267,366 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     462,900 618,320
Share Price $ 20.48 $ 22.41    
Allocated Share-based Compensation Expense, Total     $ 334,135 134,318
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     12,838  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total     $ 872,061  
Restricted Stock [Member] | Director [Member]        
Restricted Stock or Unit Expense     $ 69,652 $ 66,924
Restricted Stock [Member] | Director [Member] | Share-based Compensation Award, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   5,852    
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other Than Options, Cliff Vesting Period   1 year    
Restricted Stock [Member] | Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     6,986 6,426
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other Than Options, Cliff Vesting Period     3 years 3 years
Restricted Stock or Unit Expense     $ 95,475 $ 108,039
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     $ 169,008 $ 51,816
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%