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Note 16 - Employee Benefit Plans (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Mar. 29, 2017
Feb. 28, 2018
Feb. 28, 2017
Feb. 29, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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, Ending Balance         17,500        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term         262 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value         $ 292,200 $ 664,220      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value         292,200 664,220      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value         0 0 $ 0    
Share Price $ 20.48                
Allocated Share-based Compensation Expense, Total         585,219 498,524 $ 393,638    
Officer [Member]                  
Restricted Stock or Unit Expense         $ 263,204 $ 153,242      
Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         13,338 13,386 24,679    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total         $ 622,206        
Restricted Stock [Member] | Director [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   5,852 6,960 9,336          
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other Than Options, Cliff Vesting Period       1 year          
Restricted Stock or Unit Expense         $ 138,200 $ 135,274 $ 126,032    
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         0 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       7,486 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         $ 183,815 $ 210,008 $ 267,606    
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         54,369        
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