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Note 17 - Fair Value Measurements - Schedule of Hierarchy and Fair Value for Each Major Category of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets measured at fair value |  | $ 126,069
Fair Value, Inputs, Level 1 [Member] |  |
Assets measured at fair value |  | 0
Fair Value, Inputs, Level 2 [Member] |  |
Assets measured at fair value |  | 126,069
Fair Value, Inputs, Level 3 [Member] |  |
Assets measured at fair value |  | 0
Fair Value, Recurring [Member] |  |
Assets measured at fair value | $ 214,662 |
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Assets measured at fair value | 1,288 | 1,572
Fair Value, Recurring [Member] | Small Business Administration Agency Securities [Member] |  |
Assets measured at fair value | 4,515 | 4,691
Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets measured at fair value | 17,818 | 19,171
Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member] |  |
Assets measured at fair value | 46,336 | 11,654
Fair Value, Recurring [Member] | Commercial Paper [Member] |  |
Assets measured at fair value | 109,188 | 69,898
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Assets measured at fair value | 33,930 | 19,083
Fair Value, Recurring [Member] | Municipal Securities [Member] |  |
Assets measured at fair value | 1,587 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets measured at fair value | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Small Business Administration Agency Securities [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Obligations [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal Securities [Member] |  |
Assets measured at fair value | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured at fair value | 214,662 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] |  |
Assets measured at fair value | 1,288 | 1,572
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Small Business Administration Agency Securities [Member] |  |
Assets measured at fair value | 4,515 | 4,691
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets measured at fair value | 17,818 | 19,171
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations [Member] |  |
Assets measured at fair value | 46,336 | 11,654
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member] |  |
Assets measured at fair value | 109,188 | 69,898
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Assets measured at fair value | 33,930 | 19,083
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal Securities [Member] |  |
Assets measured at fair value | 1,587 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets measured at fair value | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Small Business Administration Agency Securities [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal Securities [Member] |  |
Assets measured at fair value | 0 |
Fair Value, Nonrecurring [Member] |  |
Assets measured at fair value | 293 |
Fair Value, Nonrecurring [Member] | Other Real Estate Owned [Member] |  |
Assets measured at fair value | 293 | 293
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets measured at fair value | 0 |
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured at fair value | 0 |
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets measured at fair value | 293 |
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] |  |
Assets measured at fair value | $ 293 | $ 293

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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