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Note 8 - Fair Value - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Securities | $ 20,751 | $ 23,829
Securities | 20,751 | 23,829
Fair Value, Inputs, Level 1 [Member] |  |
Securities | 0 | 0
Securities | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Securities | 20,751 | 23,829
Securities | 20,751 | 23,829
Fair Value, Inputs, Level 3 [Member] |  |
Securities | 0 | 0
Securities | 0 | 0
Reported Value Measurement [Member] |  |
Cash and cash equivalents | 498,583 | 503,496
Securities | 20,751 | 23,829
Loans receivable, net of allowance for loan losses | 1,028,840 | 1,002,578
FHLB and FRB stock | 7,490 | 7,490
Accrued interest receivable | 4,695 | 3,941
Certificates of deposit | 236,590 | 253,000
Borrowings | 4,000 | 4,000
Securities | 20,751 | 23,829
Estimate of Fair Value Measurement [Member] |  |
Cash and cash equivalents | 498,583 | 503,496
Securities | 20,751 | 23,829
Loans receivable, net of allowance for loan losses | 1,028,208 | 1,004,854
Accrued interest receivable | 4,695 | 3,941
Certificates of deposit | 237,119 | 253,906
Borrowings | 4,000 | 3,998
Securities | 20,751 | 23,829
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash and cash equivalents | 9,567 | 14,115
Securities | 0 | 0
Loans receivable, net of allowance for loan losses | 0 | 0
FHLB and FRB stock | 0 | 0
Accrued interest receivable | 0 | 0
Certificates of deposit | 0 | 0
Borrowings | 0 | 0
Securities | 0 | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash and cash equivalents | 489,016 | 489,381
Securities | 20,751 | 23,829
Loans receivable, net of allowance for loan losses | 0 | 0
FHLB and FRB stock | 0 | 0
Accrued interest receivable | 108 | 52
Certificates of deposit | 237,119 | 253,906
Borrowings | 4,000 | 3,998
Securities | 20,751 | 23,829
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash and cash equivalents | 0 | 0
Securities | 0 | 0
Loans receivable, net of allowance for loan losses | 1,028,208 | 1,004,854
FHLB and FRB stock | 0 | 0
Accrued interest receivable | 4,587 | 3,889
Certificates of deposit | 0 | 0
Borrowings | 0 | 0
Securities | $ 0 | $ 0

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- Definition The fair value disclosure of certificates of deposit liabilities. + References No definition available. + Details
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- Definition The fair value portion of FHLB and FRB stock. + References No definition available. + Details
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- Definition Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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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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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date. + References No definition available. + Details
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