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Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | $ 142,560 | $ 146,520
Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 142,560 | 146,520
US Government Agencies Debt Securities [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 18,853 | 21,629
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 18,853 | 21,629
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 97,001 | 97,290
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 23,813 | 24,524
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 23,813 | 24,524
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 2,079 | 2,263
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 2,079 | 2,263
Debt Securities [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 141,746 | 145,706
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 141,746 | 145,706
Equity Securities in Financial Institutions [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 814 | 814
Equity Securities in Financial Institutions [Member] | Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 814 | 814
Fair Value, Inputs, Level 1 [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 5 | 5
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 5 | 5
Fair Value, Inputs, Level 1 [Member] | Equity Securities in Financial Institutions [Member] | Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 5 | 5
Fair Value, Inputs, Level 2 [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 142,555 | 146,515
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 142,555 | 146,515
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 18,853 | 21,629
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 97,001 | 97,290
Fair Value, Inputs, Level 2 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 23,813 | 24,524
Fair Value, Inputs, Level 2 [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 2,079 | 2,263
Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | 141,746 | 145,706
Fair Value, Inputs, Level 2 [Member] | Equity Securities in Financial Institutions [Member] | Fair Value, Measurements, Recurring [Member] |  |
Note 4 - Fair Value Measurements (Details) - Assets Measured on a Recurring Basis [Line Items] |  |
Investment securities available for sale, at fair value | $ 809 | $ 809

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