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Note 10 - Short-term Borrowings (Details) - Outstanding Balances and Related Information of Short-term Borrowings - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Outstanding Balances and Related Information of Short-term Borrowings [Abstract] |  |
Balance at year-end | $ 35,825 | $ 14,808
Average balance outstanding | 11,768 | 8,379
Maximum month-end balance | $ 35,825 | $ 19,970
Weighted-average rate at year-end | 1.37% | 0.98%
Weighted-average rate during the year | 1.65% | 1.77%

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