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Note 13 - Employee Benefit Plans (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Mar. 29, 2017
Feb. 28, 2017
Feb. 29, 2016
Jun. 30, 2015
Feb. 28, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 27, 2015
May 26, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term           10 years        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage           20.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           5 years        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number           71,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term           310 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value           $ 664,220 $ 660,120      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value           664,220 660,120      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value           0 0 $ 143,350    
Share Price $ 20.48                  
Allocated Share-based Compensation Expense           498,524 $ 393,638 $ 297,295    
Officer [Member]                    
Restricted Stock or Unit Expense           $ 153,242        
Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           13,386 24,679 28,951    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized           $ 632,742        
Restricted Stock [Member] | Director [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   6,960 9,336 966 8,281          
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other Than Options, Cliff Vesting Period     1 year 3 years            
Restricted Stock or Unit Expense           $ 135,274 $ 126,032 $ 124,910    
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                
Performance Shares [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           55,823        
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 19,704    
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other Than Options, Cliff Vesting Period           3 years        
Restricted Stock or Unit Expense           $ 210,008 $ 267,606 $ 176,644    
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%                  
2015 Equity Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                 250,000  
2015 Equity Plan [Member] | Restricted Stock [Member]                    
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Aggregate Grants           41,031        
2015 Equity Plan [Member] | Performance Shares [Member]                    
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Aggregate Grants           55,823        
2010 Equity Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                   200,000
2010 Equity Plan [Member] | Restricted Stock [Member]                    
Share Based Compensation Arrangement by Share Based Payment Award Options Aggregate Grants           139,330        
2010 Equity Plan [Member] | Employee Stock Option [Member]                    
Share Based Compensation Arrangement by Share Based Payment Award Options Aggregate Grants           25,000