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Note 2 - Securities (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Note 2 - Securities (Details) [Line Items] |  |  |
Proceeds from Sale and Maturity of Marketable Securities | $ 10,550,000 |  |
Available-for-sale Securities, Gross Realized Gains | 163,000 |  |
Available-for-sale Securities Pledged as Collateral | $ 59,267,000 | $ 68,238,000 |
Debt Securities [Member] |  |  |
Note 2 - Securities (Details) [Line Items] |  |  |
Proceeds from Sale and Maturity of Marketable Securities |  | $ 0 | $ 0

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