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Note 16 - Employee Benefit Plans (Details Textual) - USD ($)
1 Months Ended 2 Months Ended 12 Months Ended
Feb. 28, 2021
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 29, 2020
Dec. 31, 2019
Nov. 05, 2021
May 27, 2015
May 26, 2010
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   $ 15.40     $ 59.99    
Director [Member]                    
Restricted Stock or Unit Expense       $ 129,486 $ 135,110   $ 131,443      
Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       20,126 20,213   15,434      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 402,246            
Restricted Stock [Member] | Director [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 6,979 5,502   13,147   5,579        
Restricted Stock [Member] | Officer [Member]                    
Restricted Stock or Unit Expense       $ 215,471 $ 114,357   $ 149,279      
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       1 year        
Performance Shares [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       0 53,075   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          
Restricted Stock or Unit Expense       $ 154,915 $ 54,948   $ 359,606      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Incentive Award Level, Threshold, Percentage     25.00%   25.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Incentive Award Level, Target, Percentage     50.00%   50.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Incentive Award Level, Percentage     100.00%   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%   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%   50.00%          
Non-Incentive Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       0 0   0      
Share-based Payment Arrangement, Option [Member]                    
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 Payment Arrangement, Option [Member] | Annual Vesting Rate [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       20.00%            
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      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)       3 years            
Restricted Stock Awards, Restricted Stock Units and Stock Options [Member]                    
Share-based Payment Arrangement, Expense       $ 499,872 $ 304,415   $ 640,328      
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, Grants in Period (in shares)       110,392            
2015 Equity Plan [Member] | Performance Shares [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (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, Equity Instruments Other than Options, Grants in Period (in shares)       139,330            
2010 Equity Plan [Member] | Non-Incentive Stock Options [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       25,000