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Note 2 - Securities (Details) - Securities by Contractual Maturity - USD ($) $ in Thousands | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Securities by Contractual Maturity [Abstract] |  |  |
Due in one year or less | $ 1,001 |  |
Due in one year or less | 1,001 |  |
Due in one year or less | 377 |  |
Due in one year or less | 386 |  |
Due in one to five years | 6,909 |  |
Due in one to five years | 7,242 |  |
Due in one to five years | 8,010 |  |
Due in one to five years | 7,964 |  |
Due in five to ten years | 10,529 |  |
Due in five to ten years | 11,057 |  |
Due after ten years | 2,083 |  |
Due after ten years | 2,100 |  |
Agency mortgage-backed securities, residential | 82,178 |  |
Agency mortgage-backed securities, residential | 82,686 |  |
Agency mortgage-backed securities, residential | 5 |  |
Agency mortgage-backed securities, residential | 5 |  |
Total debt securities | 91,189 |  |
Total debt securities | 91,651 |  |
Total debt securities | 19,903 | $ 19,903 | $ 22,820
Total debt securities | $ 20,790 |  | $ 23,570

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