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Note 2 - Bank Acquisition - Consideration Transferred and Assets Acquired and Liabilities Assumed (Details) - USD ($) | Oct. 25, 2019 | Sep. 30, 2020 | Dec. 31, 2019
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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 |  |

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- Definition Interest earned but not received, acquired at the acquisition date. + References No definition available. + Details
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- Definition Amount of FHLB stock acquired at the acquisition date. + References No definition available. + Details
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- Definition The amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold, acquired at the acquisition date. + References No definition available. + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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- Definition Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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