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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 |

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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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