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Note 3 - Delinquency Status of Non-accrual Loans and Past Due Matured Loans (Details) - USD ($) | Jun. 30, 2016 | Dec. 31, 2015
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Pass [Member] | Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Pass [Member] | Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Pass [Member] | Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Pass [Member] | Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] |  |
Non accrual loans current |  |
Pass [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Pass [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Pass [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Pass [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Substandard [Member] | Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Substandard [Member] | Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Substandard [Member] | Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 3,208,000 |
Substandard [Member] | Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] |  |
Non accrual loans current |  |
Non accrual loans past due | 3,208,000 |
Substandard [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 3,208,000 |
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] |  |
Non accrual loans current |  |
Non accrual loans past due |  |
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Substandard [Member] | Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Substandard [Member] | Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Substandard [Member] | Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 1,590,000 | 1,590,000
Substandard [Member] | Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] |  |
Non accrual loans current |  |
Non accrual loans past due | 1,590,000 | 1,590,000
Substandard [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 1,590,000 | 1,590,000
Substandard [Member] | Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Substandard [Member] | Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Substandard [Member] | Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 2,000 | 3,000
Substandard [Member] | Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] |  |
Non accrual loans current |  |
Non accrual loans past due | 2,000 | 3,000
Substandard [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 2,000 | 3,000
Substandard [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 4,800,000 | 1,593,000
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 3,208,000 |
Commercial Portfolio Segment [Member] | Non-Accrual Loans [Member] |  |
Non accrual loans current |  |
Non accrual loans past due | 3,208,000 |
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 3,208,000 |
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Commercial Real Estate Portfolio Segment [Member] | Non-Accrual Loans [Member] |  |
Non accrual loans current |  |
Non accrual loans past due |  |
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 1,590,000 | 1,590,000
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] |  |
Non accrual loans current |  |
Non accrual loans past due | 1,590,000 | 1,590,000
Residential Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 1,590,000 | 1,590,000
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 2,000 | 3,000
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] |  |
Non accrual loans current |  |
Non accrual loans past due | 2,000 | 3,000
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 2,000 | 3,000
Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status |  |
Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 4,800,000 | 1,593,000
Non-Accrual Loans [Member] |  |
Non accrual loans current |  |
Non accrual loans past due | 4,800,000 | 1,593,000
Financing Receivable, Recorded Investment, Nonaccrual Status | $ 4,800,000 | $ 1,593,000

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