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Note 12 - Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
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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 |  |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |  |
Available-for-sale securities |  |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available-for-sale securities |  |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member] |  |  |
Available-for-sale securities |  |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale securities |  |  |
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 |  | 12,139,000 | 13,413,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |  |
Available-for-sale securities |  |  | 4,954,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available-for-sale securities |  | 8,898,000 | 9,010,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member] |  |  |
Available-for-sale securities |  | 2,000,000 | 2,000,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale securities |  | 23,037,000 | 29,377,000
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 |  |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |  |
Available-for-sale securities |  |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available-for-sale securities |  |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member] |  |  |
Available-for-sale securities |  |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale securities |  |  |
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Available-for-sale securities |  | 12,139,000 | 13,413,000
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |  |
Available-for-sale securities |  |  | 4,954,000
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Available-for-sale securities |  | 8,898,000 | 9,010,000
Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member] |  |  |
Available-for-sale securities |  | 2,000,000 | 2,000,000
Fair Value, Measurements, Recurring [Member] |  |  |
Available-for-sale securities |  | 23,037,000 | 29,377,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Available-for-sale securities |  | 12,139,000 | 13,413,000
US Government Agencies Debt Securities [Member] |  |  |
Available-for-sale securities |  |  | 4,954,000
Corporate Debt Securities [Member] |  |  |
Available-for-sale securities |  | 8,898,000 | 9,010,000
Subordinated Notes [Member] |  |  |
Available-for-sale securities |  | 2,000,000 | 2,000,000
Available-for-sale securities | $ 23,037,000 | $ 23,037,000 | $ 29,377,000

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