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Note 4 - Loans Receivable and Allowance for Loan and Lease Losses - Recorded Investment in TDRs (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 | Dec. 31, 2018 USD ($)
Number of contracts | 6 | 0 | 5
Recorded investment | $ 10,855,000 |  | $ 2,066,000
Recorded investment | $ (10,855,000) |  | $ (2,066,000)
Non-Accrual Loans [Member] |  |  |
Number of contracts | 1 |  |
Recorded investment | $ 8,800,000 |  |
Recorded investment | $ (8,800,000) |  |
Accrual Loans [Member] |  |  |
Number of contracts | 5 |  | 5
Recorded investment | $ 2,055,000 |  | $ 2,066,000
Recorded investment | $ (2,055,000) |  | $ (2,066,000)
Commercial Real Estate Portfolio Segment [Member] |  |  |
Number of contracts | 2 |  | 2
Recorded investment | $ 1,073,000 |  | $ 1,081,000
Recorded investment | $ (1,073,000) |  | $ (1,081,000)
Residential Portfolio Segment [Member] |  |  |
Number of contracts | 1 |  | 1
Recorded investment | $ 292,000 |  | $ 296,000
Recorded investment | $ (292,000) |  | $ (296,000)
Consumer Portfolio Segment [Member] |  |  |
Number of contracts | 2 |  | 2
Recorded investment | $ 690,000 |  | $ 689,000
Recorded investment | $ (690,000) |  | $ (689,000)
Construction Portfolio Segment [Member] |  |  |
Number of contracts | 1 |  |
Recorded investment | $ 8,800,000 |  |
Recorded investment | $ (8,800,000) |  |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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- Definition Amount of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554 + Details
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