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Note 2 - Bank Acquisition - Consideration Transferred and Assets Acquired and Liabilities Assumed (Details) - USD ($)
Oct. 25, 2019
Jun. 30, 2020
Dec. 31, 2019
Recognized amounts of identifiable assets acquired and liabilities assumed:      
Goodwill   $ 12,424,434 $ 12,114,559
Iowa State Savings Bank [Member]      
Payments to Acquire Businesses, Gross $ 22,643,000    
Recognized amounts of identifiable assets acquired and liabilities assumed:      
Cash and due from banks 3,188,000    
Federal funds sold 2,792,000    
Interest bearing deposits in financial institutions 21,035,000    
Securities available-for-sale 33,615,000    
Federal Home Loan Bank stock at cost 365,000    
Loans receivable 137,776,000    
Accrued interest receivable 2,888,000    
Bank premises and equipment 2,452,000    
Other real estate owned 3,582,000    
Bank owned life insurance 2,499,000    
Core deposit intangible asset 1,891,000    
Other assets 204,000    
Deposits (188,631,000)    
Securities sold under repurchase agreements (1,747,000)    
Accrued interest payable and other liabilities (1,946,000)    
Total identifiable net assets 19,963,000    
Goodwill $ 2,680,000