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Note 5 - Benefit Plans (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 29, 2017
Feb. 28, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value         $ 0 $ 169,103
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     $ 669,800 $ 438,800 669,800 438,800
Share Price $ 20.48          
Allocated Share-based Compensation Expense     136,263 $ 100,594 363,041 313,855
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 768,224   768,224  
Officer [Member]            
Restricted Stock or Unit Expense         $ 102,529  
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         13,386  
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  
Restricted Stock [Member] | Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   6,960        
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         $ 101,099 $ 94,136
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   6,195        
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other Than Options, Cliff Vesting Period   1 year        
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, Grants in Period   765        
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other Than Options, Cliff Vesting Period   3 years        
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       6,426 15,343
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other Than Options, Cliff Vesting Period         3 years  
Restricted Stock or Unit Expense         $ 159,413 $ 209,430
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%