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Note 3 - Available-for-sale Securities (Details Textual) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 38 |  | 38 |  | 32
Number of Available-for-sale Securities | 39 |  | 39 |  | 39
Unrealized Holding Losses Depreciation Percentage from Amortized Cost | 16.60% |  | 16.60% |  | 2.70%
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total |  |  | $ 0 |  |
Payments to Acquire Debt Securities, Available-for-Sale |  |  | 3,039,000 | $ 81,764,000 |
Proceeds from Sale of Debt Securities, Available-for-Sale | $ 0 |  | 0 |  |
Debt Securities, Available-for-Sale, Realized Gain (Loss), Total |  | $ 93,000 | (0) | 93,000 |
Corporate Debt Securities [Member] |  |  |  |  |
Payments to Acquire Debt Securities, Available-for-Sale |  |  | 2,000,000.0 | 14,200,000 |
Proceeds from Sale of Debt Securities, Available-for-Sale |  | 14,000,000.0 |  | 14,000,000.0 |
Subordinated Notes [Member] |  |  |  |  |
Payments to Acquire Debt Securities, Available-for-Sale |  |  | 1,000,000.0 |  |
Proceeds from Sale of Debt Securities, Available-for-Sale |  | 4,500,000 |  | 4,500,000 |
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |  |  |
Payments to Acquire Debt Securities, Available-for-Sale |  |  |  | 61,700,000 |
Proceeds from Sale of Debt Securities, Available-for-Sale |  | $ 4,300,000 |  | 4,300,000 |
SBA Loan Pools [Member] |  |  |  |  |
Payments to Acquire Debt Securities, Available-for-Sale |  |  |  | $ 5,900,000 |
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member] |  |  |  |  |
Debt Securities, Available-for-Sale, Restricted | $ 30,600,000 |  | $ 30,600,000 |  | $ 36,600,000

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- Definition Amount of realized gain (loss) on 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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