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Note 4 - Investment Securities Available-for-sale (Details) - Ratings by Segment of Investment Securities Available for Sale
Dec. 31, 2014
Note 4 - Investment Securities Available-for-sale (Details) - Ratings by Segment of Investment Securities Available for Sale [Line Items]  
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Standard & Poor's, AAA Rating [Member]  
Note 4 - Investment Securities Available-for-sale (Details) - Ratings by Segment of Investment Securities Available for Sale [Line Items]  
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Standard and Poor's AA+ - AA- [Member]  
Note 4 - Investment Securities Available-for-sale (Details) - Ratings by Segment of Investment Securities Available for Sale [Line Items]  
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Not Rated [Member]  
Note 4 - Investment Securities Available-for-sale (Details) - Ratings by Segment of Investment Securities Available for Sale [Line Items]  
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Moody's, Aaa Rating [Member]  
Note 4 - Investment Securities Available-for-sale (Details) - Ratings by Segment of Investment Securities Available for Sale [Line Items]  
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Moody's Aa1 - Aa3 [Member]  
Note 4 - Investment Securities Available-for-sale (Details) - Ratings by Segment of Investment Securities Available for Sale [Line Items]  
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Moody's A1-A2 [Member]  
Note 4 - Investment Securities Available-for-sale (Details) - Ratings by Segment of Investment Securities Available for Sale [Line Items]  
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Not Rated [Member]  
Note 4 - Investment Securities Available-for-sale (Details) - Ratings by Segment of Investment Securities Available for Sale [Line Items]  
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