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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
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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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