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Note 6 - Fair Value Measurements - Estimated Fair Values of Financial Instruments (Details) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Securities available-for-sale | $ 489,303,666 | $ 479,843,448
Accrued income receivable | 10,247,519 | 11,788,409
Reported Value Measurement [Member] |  |
Securities available-for-sale | 489,304,000 | 479,843,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash and due from banks | 32,057,000 | 34,617,000
Interest bearing deposits | 136,466,000 | 108,948,000
Accrued income receivable | 10,248,000 | 11,788,000
Securities sold under agreements to repurchase | 41,618,000 | 42,034,000
Accrued interest payable | 1,045,000 | 1,163,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
FHLB and FRB stock | 3,160,000 | 3,139,000
Loans receivable, net | 1,079,657,000 | 1,048,147,000
Loans held for sale | 907,000 | 2,777,000
Deposits | 1,552,425,000 | 1,493,175,000
FHLB advances | 3,000,000 | 5,000,000
Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale | 489,304,000 | 479,843,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash and due from banks | 32,057,000 | 34,617,000
Interest bearing deposits | 136,466,000 | 108,948,000
Accrued income receivable | 10,248,000 | 11,788,000
Securities sold under agreements to repurchase | 41,618,000 | 42,034,000
Accrued interest payable | 1,045,000 | 1,163,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
FHLB and FRB stock | 3,160,000 | 3,139,000
Loans receivable, net | 1,059,978,000 | 1,025,032,000
Loans held for sale | 907,000 | 2,777,000
Deposits | 1,556,440,000 | 1,495,155,000
FHLB advances | $ 3,062,000 | $ 4,935,000

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + 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(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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