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Note 4 - Loan Receivables and Allowance for Loan Losses (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Maximum Period of Credit Extension of Construction Loans | 18 months |  |
Period for Charged Off of Open-End Credits | 180 days |  |
Period for Charged Off of Close-End Credits | 120 days |  |
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans | $ 83,000 | $ 23,000 | $ 310,000
Threshold Period Past Due for Write-off of Financing Receivable | 90 days |  |
Maximum Period for Charged Off of Consumer Installment Loans | 180 days |  |
Performance Period Under Loan Terms | 6 months |  |
Financing Receivable, Modifications, Number of Contracts | 0 | 2 |
Financing Receivable, Modifications, Recorded Investment |  | $ 2,400,000 |
Loans and Leases Receivable, Impaired, Commitment to Lend | $ 0 | $ 0 |
Number of Borrowers | 11 | 14 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 2,439,000 | 4,730,000
Impaired loans | $ 12,851,000 | 11,717,000 |
Impaired Financing Receivable, Related Allowance | 3,000 | $ 7,000 |
Restructured [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 1 |
Financing Receivable, Modifications, Recorded Investment |  | $ 1,200,000 |
Upgraded to Pass Impaired [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  | 1,300,000 |
Non-Accrual Loans [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Impaired Financing Receivable, Interest Income, Cash Basis Method | $ 0 | 0 | $ 198,000
Upgraded as to Risk Rating [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 3,700,000 |
Paid Off [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 4 |
Upgraded [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 2 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Maximum Percentage of Credit Extension Based on Market Value of Collateral | 75.00% |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 2,439,000 |
Proceeds from Financing Receivable Restructured Loan Paid Off |  | 3,900,000 |
Impaired loans | $ 7,745,000 | $ 7,398,000 |
Commercial Real Estate Portfolio Segment [Member] | Paid Off [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 2 |
Multi-family Real Estate [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Maximum Percentage of Credit Extension Based on Market Value of Collateral | 80.00% |  |
Construction Portfolio Segment [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Percentage of Maximum Loan to Value | 75.00% |  |
Construction to Permanent Portfolio Segment [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Number of Borrowers |  |  | 1
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  |  | $ 4,730,000
Construction to Permanent Portfolio Segment [Member] | Downgraded [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts |  |  | 2
Construction to Permanent Real Estate Financing Receivable Loan One [Member] | Downgraded [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  |  | $ 3,700,000
Construction to Permanent Real Estate Financing Receivable Loan Two [Member] | Downgraded [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  |  | $ 1,000,000
Commercial Portfolio Segment [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Proceeds from Financing Receivable Restructured Loan Paid Off |  | $ 37,000 |
Impaired loans |  | 2,000 |
Residential Portfolio Segment [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Proceeds from Financing Receivable Restructured Loan Paid Off |  | 4,400,000 |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 500,000 |
Impaired loans | $ 4,556,000 | 3,764,000 |
Residential Portfolio Segment [Member] | Upgraded [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 347,000 |
Residential Portfolio Segment [Member] | Charged Off [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 1 |
Consumer Portfolio Segment [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Impaired loans | 550,000 | $ 553,000 |
Impaired Financing Receivable, Related Allowance | $ 3,000 | 7,000 |
Consumer Portfolio Segment [Member] | Upgraded [Member] | Home Equity Loan [Member] |  |  |
Note 4 - Loan Receivables and Allowance for Loan Losses (Details) [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 563,000 |

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