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Note 2 - Acquisition of Carroll Bancorp, Inc. (Details Textual) - USD ($)
12 Months Ended
Oct. 01, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets, Total   $ 716,677,255 $ 677,317,082  
Liabilities, Total   660,055,797 625,587,599  
Deposits, Total   626,414,670 573,401,547  
Goodwill, Ending Balance   $ 6,978,208 6,978,208 $ 0
Core Deposits [Member]        
Finite-Lived Intangible Asset, Useful Life (Year)   10 years    
Carroll Bancorp, Inc.[Member]        
Assets, Total $ 176,159,890      
Financing Receivable, after Allowance for Credit Loss, Total 145,153,100      
Liabilities, Total 157,992,286      
Deposits, Total 144,896,990      
Carroll Bancorp, Inc.[Member]        
Business Combination, Consideration Transferred, Total 24,807,728      
Payments to Acquire Businesses, Gross 7,800,000      
Business Combination, Consideration Transferred, Liabilities Incurred 17,000,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total 176,432,748      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Total 158,603,228      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net, Total 17,829,520      
Goodwill, Ending Balance 6,978,208      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 83,282      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Certificates of Deposit Premium 616,377      
Accretion Expense   $ 249,840 $ 129,844  
Carroll Bancorp, Inc.[Member] | Core Deposits [Member]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 83,282      
Finite-Lived Intangible Asset, Useful Life (Year) 10 years