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Note 2 - Business Combinations (Details Textual) |  |  |  | 11 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Aug. 29, 2018 USD ($) | May 10, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Assets, Total | $ 951,696,000 |  |  | $ 951,696,000 | $ 951,696,000 | $ 852,080,000
Marketable Securities, Total | 44,459,000 |  |  | 44,459,000 | 44,459,000 | 30,538,000
Deposits, Total | 743,281,000 |  |  | 743,281,000 | 743,281,000 | 637,439,000
Goodwill, Ending Balance | 1,728,000 |  |  | 1,728,000 | 1,728,000 |
Goodwill, Impairment Loss |  |  |  |  | $ 0 |
Finite-Lived Intangible Assets, Remaining Amortization Period |  |  |  |  | 10 years |
Prime Bank [Member] |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  | $ 707,000 |
Goodwill, Ending Balance | 1,728,000 |  | $ 2,392,000 | 1,728,000 | 1,728,000 |
Business Combination, Initial Cash Purchase Price |  |  | 5,890,000 |  |  |
Business Combination, Final Estimated Purchase Price |  |  | 1,000,000 |  |  |
Payments to Acquire Businesses, Gross | 6,223,000 | $ 1,280,000 | 5,888,000 |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  | $ 1,570,000 |  |  |  |
Business Combination, Contingent Consideration, Liability, Total | $ 707,000 |  | $ 1,761,000 | 707,000 | $ 707,000 |
Prime Bank [Member] | Core Deposits [Member] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 10 years |  |  |
Prime Bank [Member] | Securities Acquired in Business Acquisition [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale, Realized Gain (Loss), Total |  |  | $ 0 |  |  |
Prime Bank [Member] | Measurement Input, Account Balance Growth Rate [Member] |  |  |  |  |  |
Core Deposit, Measurement Input |  |  | 0.03 |  |  |
Hana SBL [Member] |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  | $ 1,150,000 |  |
Prime Bank [Member] |  |  |  |  |  |
Assets, Total |  |  | $ 65,000,000 |  |  |
Marketable Securities, Total |  |  | 36,000,000 |  |  |
Loans Payable, Total |  |  | 23,000,000 |  |  |
Deposits, Total |  |  | $ 46,000,000 |  |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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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/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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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://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=77989000&loc=SL49117168-202975 Reference 2: 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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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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