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Note 2 - Acquisition (Details Textual) - SinoPac Bancorp [Member] - USD ($) | Dec. 12, 2017 | Nov. 14, 2017 | Nov. 04, 2017 | Jul. 14, 2017 | Dec. 31, 2018 | Dec. 31, 2017
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Business Combination, Aggregate Purchase Price |  |  |  | $ 351,600,000 |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares |  |  |  | 926,192 |  |
Payments to Acquire Businesses, Gross |  | $ 100,000,000 | $ 100,000,000 | $ 285,324,000 |  |
Business Combination, Deferred Payments |  |  | $ 35,200,000 |  | $ 17,600,000 | $ 35,400,000
Business Combination, Addition Cash Consideration Related to Realized Gain from Sale of Building | $ 4,100,000 |  |  |  |  |

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- Definition The addition cash consideration was paid based on the realized gain from the sale of the building. + References No definition available. + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + 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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