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Note 7 - Loans and Related Allowance for Loan Losses - Impaired Loans by Class (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Recorded investment | $ 17,008 | $ 12,430
Unpaid principal balance | 16,873 | 12,405
Recorded investment, with no related allowance | 7,224 | 5,405
Unpaid principal balance, with no related allowance | 7,146 | 5,394
Recorded investment, with related allowance | 9,784 | 7,025
Unpaid principal balance, with related allowance | 9,727 | 7,011
Related allowance | 1,732 | 527
Commercial Loans [Member] |  |
Recorded investment, with related allowance | 7,138 |
Unpaid principal balance, with related allowance | 7,092 |
Related allowance | 1,207 |
Commercial And Industrial [Member] |  |
Recorded investment | 3,084 | 1,190
Unpaid principal balance | 3,073 | 1,186
Recorded investment, with no related allowance | 1,539 | 319
Unpaid principal balance, with no related allowance | 1,535 | 318
Recorded investment, with related allowance | 1,545 | 871
Unpaid principal balance, with related allowance | 1,538 | 868
Related allowance | 335 | 90
Real Estate Construction Porfolio Segment [Member] |  |
Recorded investment | 541 | 913
Unpaid principal balance | 507 | 909
Recorded investment, with no related allowance | 541 | 913
Unpaid principal balance, with no related allowance | 507 | 909
Recorded investment, with related allowance |  |
Unpaid principal balance, with related allowance |  |
Related allowance |  |
Real Estate Construction Porfolio Segment [Member] | Residential Loan [Member] |  |
Recorded investment, with related allowance | 1,097 |
Unpaid principal balance, with related allowance | 1,093 |
Related allowance | 190 |
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] |  |
Recorded investment | 3,170 | 3,135
Unpaid principal balance | 3,152 | 3,131
Recorded investment, with no related allowance | 2,073 | 2,142
Unpaid principal balance, with no related allowance | 2,059 | 2,140
Recorded investment, with related allowance |  | 993
Unpaid principal balance, with related allowance |  | 991
Related allowance | 190 | 251
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member] |  |
Recorded investment | 10,209 | 7,187
Unpaid principal balance | 10,137 | 7,174
Recorded investment, with no related allowance | 3,071 | 2,031
Unpaid principal balance, with no related allowance | 3,045 | 2,027
Recorded investment, with related allowance |  | 5,156
Unpaid principal balance, with related allowance |  | 5,147
Related allowance | 1,207 | 186
Consumer Portfolio Segment [Member] |  |
Recorded investment | 4 | 5
Unpaid principal balance | 4 | 5
Recorded investment, with no related allowance |  |
Unpaid principal balance, with no related allowance |  |
Recorded investment, with related allowance |  | 5
Unpaid principal balance, with related allowance |  | 5
Related allowance |  |

X
- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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