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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
12 Months Ended
Mar. 04, 2020
Sep. 16, 2019
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Deferred Income Tax Assets, Net, Total     $ 1,036,078 $ 1,179,454  
Stock Dividends, Percent   75.00%      
Dividends Payable, Date to be Paid   Oct. 31, 2019      
Weighted Average Number of Shares Outstanding, Basic, Total     2,952,904 2,925,631  
Subsequent Event [Member] | Carroll Bancorp, Inc.[Member]          
Business Acquisition, Pro Forma Total Assets $ 512,000,000        
Business Combination, Consideration Transferred, Total 25,000,000        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 18,200,000        
Accounting Standards Update 2016-01 [Member]          
Reclassification Due to Adoption of ASU        
Accounting Standards Update 2016-02 [Member]          
Reclassification Due to Adoption of ASU     $ (91,447)    
Operating Lease, Right-of-Use Asset         $ 1,400,855
Operating Lease, Liability, Total         1,527,019
Deferred Income Tax Assets, Net, Total         34,717
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]          
Reclassification Due to Adoption of ASU       (10,416)  
Retained Earnings [Member] | Accounting Standards Update 2016-02 [Member]          
Reclassification Due to Adoption of ASU     (91,447)    
Cumulative Effect of New Accounting Principle in Period of Adoption         $ 91,447
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member]          
Reclassification Due to Adoption of ASU       $ 10,416  
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-02 [Member]          
Reclassification Due to Adoption of ASU        
First Community Bankers Insurance Co., LLC [Member]          
Percentage of Ownership     100.00%