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Note 2 - Bank Acquisitions - Consideration Transferred and Assets Acquired and Liabilities Assumed (Details) - USD ($)
Oct. 25, 2019
Dec. 31, 2020
Dec. 31, 2019
Goodwill   $ 12,424,434 $ 12,114,559
Iowa State Savings Bank [Member]      
Payments to Acquire Businesses, Gross $ 22,643,000    
Cash and due from banks 3,188,000    
Federal funds sold 2,792,000 0  
Interest-bearing deposits in financial institutions 21,035,000 0  
Securities available-for-sale 33,615,000 0  
Federal Home Loan Bank stock at cost 365,000    
Loans receivable 137,776,000 0  
Accrued interest receivable 2,888,000 0  
Bank premises and equipment 2,452,000 0  
Other real estate owned 3,582,000 0  
Bank-owned life insurance 2,499,000 0  
Core deposit intangible asset 1,891,000 0  
Other assets 204,000    
Deposits (188,631,000) 0  
Securities sold under repurchase agreements (1,747,000)    
Accrued interest payable and other liabilities (1,946,000) 0  
Total identifiable net assets 19,963,000    
Goodwill $ 2,680,000 $ 309,875