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Note 2 - Mergers and Acquisitions (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2020
Jan. 01, 2019
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Goodwill, Ending Balance     $ 20,798,000   $ 15,836,000     $ 20,798,000   $ 15,836,000
Finite-Lived Intangible Assets, Net, Ending Balance     2,505,000   2,786,000     2,505,000   2,786,000
Business Combination, Acquisition Related Costs     0     $ 517,000   $ 157,000 $ 1,693,000  
Core Deposits [Member]                    
Finite-Lived Intangible Asset, Useful Life (Year)               10 years    
Big Muddy Bancorp Acquisition [Member]                    
Business Combination, Consideration Transferred, Total   $ 16,436,000                
Payments to Acquire Businesses, Gross   1,000                
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable   16,435,000                
Goodwill, Acquired During Period             $ 3,586,000      
Goodwill, Purchase Accounting Adjustments         126,000          
Goodwill, Ending Balance   3,586,000     $ 3,712,000         3,712,000
Business Combination, Acquired Loans Discount   2,813,000 820,000         $ 820,000    
Business Combination, Accretion of Loan Discount     182,000         513,000   1,480,000
Business Acquisition, Impairment Loans   556,000 129,000         129,000    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment               276,000    
Business Combination, Acquisition Related Costs                   $ 1,380,000
Effective Income Tax Rate Reconciliation, Percent, Total                   20.00%
Big Muddy Bancorp Acquisition [Member] | Core Deposits [Member]                    
Finite-Lived Intangible Assets, Net, Ending Balance     1,988,000         1,988,000    
WHC [Member]                    
Business Combination, Consideration Transferred, Total $ 14,967,000                  
Payments to Acquire Businesses, Gross 6,500,000                  
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 8,467,000                  
Goodwill, Acquired During Period       $ 4,962,000            
Goodwill, Ending Balance 4,962,000                  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Investments   $ 425,000                
Business Combination, Acquired Loans Discount $ 1,166,000   654,000         654,000    
Business Combination, Accretion of Loan Discount     264,000         512,000    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment               590,000    
Business Combination, Acquisition Related Costs     0         157,000   $ 818,000
WHC [Member] | Core Deposits [Member]                    
Finite-Lived Intangible Assets, Net, Ending Balance     $ 208,000         $ 208,000