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Note 5 - Benefit Plans (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 29, 2017
Feb. 28, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value         $ 0 $ 169,103
Share Price $ 20.48          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     $ 618,320 $ 430,880 618,320 430,880
Allocated Share-based Compensation Expense     134,318 $ 126,403 226,779 213,260
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 940,486   $ 940,486  
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 20.33  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         13,386  
Restricted Stock [Member] | Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 20.35        
Restricted Stock or Unit Expense         $ 66,924 62,240
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   6,960        
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 Cliff Vesting Period   1 year        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   6,195        
Restricted Stock [Member] | Director [Member] | Share-based Compensation Award, Tranche Two [Member]            
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other Than Options Cliff Vesting Period   3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   765        
Restricted Stock Units (RSUs) [Member]            
Restricted Stock or Unit Expense         $ 51,816  
Restricted Stock Units (RSUs) [Member] | Officer [Member]            
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other Than Options Cliff Vesting Period         3 years  
Restricted Stock or Unit Expense         $ 108,039 $ 151,020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 55,823       6,426 15,343
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%