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Note 4 - Loan Receivables and Allowance for Loan Losses (Details) - Impaired Loans - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
With no related allowance recorded: |  |  |
With no related allowance recorded - recorded investment | $ 12,848,000 | $ 11,717,000 |
With no related allowance recorded - unpaid principal balance | 14,834,000 | 13,511,000 |
With an allowance recorded: |  |  |
With related allowance recorded - recorded investment | 3,000 |  |
With related allowance recorded - unpaid principal balance | 3,000 | 7,000 |
With related allowance recorded - related allowance | 3,000 | 7,000 |
Impaired loans | 12,851,000 | 11,717,000 |
Unpaid principal balance | 14,837,000 | 13,518,000 |
Related allowance | 3,000 | 7,000 |
With no related allowance recorded: |  |  |
With no related allowance recorded - average recorded investment | 12,063,000 | 13,786,000 | $ 20,952,000
With no related allowance recorded - interest income recognized | 517,000 | 494,000 | 452,000
With an allowance recorded: |  |  |
With related allowance recorded - average recorded investment | 3,000 | 7,000 | 9,846,000
Average recorded investment | 12,066,000 | 13,793,000 | 30,798,000
Interest income recognized | 517,000 | 494,000 | 452,000
Commercial Portfolio Segment [Member] |  |  |
With no related allowance recorded: |  |  |
With no related allowance recorded - recorded investment |  | 2,000 |
With no related allowance recorded - unpaid principal balance | 96,000 | 104,000 |
With an allowance recorded: |  |  |
Impaired loans |  | 2,000 |
Unpaid principal balance | 96,000 | 104,000 |
With no related allowance recorded: |  |  |
With no related allowance recorded - average recorded investment |  | 215,000 | 11,000
With an allowance recorded: |  |  |
With related allowance recorded - average recorded investment |  |  | 3,646,000
Average recorded investment |  | 215,000 | 3,657,000
Commercial Real Estate Portfolio Segment [Member] |  |  |
With no related allowance recorded: |  |  |
With no related allowance recorded - recorded investment | 7,745,000 | 7,398,000 |
With no related allowance recorded - unpaid principal balance | 8,259,000 | 8,249,000 |
With an allowance recorded: |  |  |
Impaired loans | 7,745,000 | 7,398,000 |
Unpaid principal balance | 8,259,000 | 8,249,000 |
With no related allowance recorded: |  |  |
With no related allowance recorded - average recorded investment | 8,001,000 | 8,262,000 | 10,517,000
With no related allowance recorded - interest income recognized | 373,000 | 342,000 | 295,000
With an allowance recorded: |  |  |
With related allowance recorded - average recorded investment |  |  | 3,501,000
Average recorded investment | 8,001,000 | 8,262,000 | 14,018,000
Interest income recognized | 373,000 | 342,000 | 295,000
Construction Portfolio Segment [Member] |  |  |
With no related allowance recorded: |  |  |
With no related allowance recorded - unpaid principal balance | 287,000 |  |
With an allowance recorded: |  |  |
Unpaid principal balance | 287,000 | 732,000 |
With an allowance recorded: |  |  |
With related allowance recorded - average recorded investment |  |  | 1,228,000
Average recorded investment |  |  | 1,228,000
Construction to Permanent Portfolio Segment [Member] |  |  |
With no related allowance recorded: |  |  |
With no related allowance recorded - average recorded investment |  |  | 1,226,000
With an allowance recorded: |  |  |
Average recorded investment |  |  | 1,226,000
Residential Portfolio Segment [Member] |  |  |
With no related allowance recorded: |  |  |
With no related allowance recorded - recorded investment | 4,556,000 | 3,764,000 |
With no related allowance recorded - unpaid principal balance | 5,559,000 | 3,793,000 |
With an allowance recorded: |  |  |
Impaired loans | 4,556,000 | 3,764,000 |
Unpaid principal balance | 5,559,000 | 3,793,000 |
With no related allowance recorded: |  |  |
With no related allowance recorded - average recorded investment | 3,512,000 | 4,734,000 | 8,603,000
With no related allowance recorded - interest income recognized | 126,000 | 129,000 | 143,000
With an allowance recorded: |  |  |
With related allowance recorded - average recorded investment |  |  | 1,469,000
Average recorded investment | 3,512,000 | 4,734,000 | 10,072,000
Interest income recognized | 126,000 | 129,000 | 143,000
Consumer Portfolio Segment [Member] |  |  |
With no related allowance recorded: |  |  |
With no related allowance recorded - recorded investment | 547,000 | 553,000 |
With no related allowance recorded - unpaid principal balance | 633,000 | 633,000 |
With an allowance recorded: |  |  |
With related allowance recorded - recorded investment | 3,000 |  |
With related allowance recorded - unpaid principal balance | 3,000 | 7,000 |
With related allowance recorded - related allowance | 3,000 | 7,000 |
Impaired loans | 550,000 | 553,000 |
Unpaid principal balance | 636,000 | 640,000 |
Related allowance | 3,000 | 7,000 |
With no related allowance recorded: |  |  |
With no related allowance recorded - average recorded investment | 550,000 | 575,000 | 595,000
With no related allowance recorded - interest income recognized | 18,000 | 23,000 | 14,000
With an allowance recorded: |  |  |
With related allowance recorded - average recorded investment | 3,000 | 7,000 | 2,000
Average recorded investment | 553,000 | 582,000 | 597,000
Interest income recognized | $ 18,000 | $ 23,000 | $ 14,000

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