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Note 9 - Fair Value and Interest Rate Risk - Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale securities, at fair value | $ 24,981 | $ 24,428
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities, at fair value | 8,422 | 10,441
Corporate Debt Securities [Member] |  |
Available-for-sale securities, at fair value | 8,954 | 8,961
Subordinated Notes [Member] |  |
Available-for-sale securities, at fair value | 7,605 | 5,026
Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities, at fair value | 24,981 | 24,428
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities, at fair value | 8,422 | 10,441
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |
Available-for-sale securities, at fair value | 8,954 | 8,961
Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member] |  |
Available-for-sale securities, at fair value | 7,605 | 5,026
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities, at fair value |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities, at fair value |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |
Available-for-sale securities, at fair value |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member] |  |
Available-for-sale securities, at fair value |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities, at fair value | 22,981 | 22,428
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities, at fair value | 8,422 | 10,441
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |
Available-for-sale securities, at fair value | 8,954 | 8,961
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member] |  |
Available-for-sale securities, at fair value | 5,605 | 3,026
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Available-for-sale securities, at fair value | 2,000 | 2,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available-for-sale securities, at fair value |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |
Available-for-sale securities, at fair value |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member] |  |
Available-for-sale securities, at fair value | $ 2,000 | $ 2,000

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