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Note 18 - Employee Benefit Plans (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Feb. 29, 2020
Mar. 31, 2019
Feb. 28, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
May 27, 2015
May 26, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)       10 years        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       5 years        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares)       0 0 0    
Share Price (in dollars per share)       $ 15.40        
Officer [Member]                
Restricted Stock or Unit Expense       $ 54,948 $ 359,606 $ 263,204    
Annual Vesting Rate [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       20.00%        
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       20,213 15,434 13,338    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 429,294        
Restricted Stock [Member] | Director [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 5,579 5,502 5,852          
Restricted Stock or Unit Expense       $ 135,110 $ 131,443 $ 138,200    
Restricted Stock [Member] | Share-based Payment Arrangement, Tranche One [Member] | Director [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 1 year 1 year            
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other Than Options, Cliff Vesting Period (Year)     1 year          
Performance Shares [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       53,075 0 0    
Performance Shares [Member] | Officer [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       53,075        
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%        
Restricted Stock Units (RSUs) [Member] | Officer [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       14,634 9,932 7,486    
Share-based Compensation Arrangement by Share-based Payment Award Equity Instruments Other Than Options, Cliff Vesting Period (Year)       3 years        
Restricted Stock or Unit Expense       $ 114,357 $ 149,279 $ 183,815    
Restricted Stock Awards, Restricted Stock Units and Stock Options [Member]                
Share-based Payment Arrangement, Expense       $ 304,415 $ 640,328 $ 585,219    
2015 Equity Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)             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 (in shares)       90,016        
2015 Equity Plan [Member] | Performance Shares [Member]                
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Aggregate Grants (in shares)       108,898        
2010 Equity Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)               200,000
2010 Equity Plan [Member] | Restricted Stock [Member]                
Share Based Compensation Arrangement by Share Based Payment Award Options Aggregate Grants (in shares)       139,330        
2010 Equity Plan [Member] | Share-based Payment Arrangement, Option [Member]                
Share Based Compensation Arrangement by Share Based Payment Award Options Aggregate Grants (in shares)       25,000