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Note 9 - Short-Term Borrowings (Detail) - Outstanding Balances and Related Information of Short-Term Borrowings (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Balance at year-end $ 6,538 $ 7,392 $ 7,632
Average balance outstanding 7,005 7,276 7,320
Maximum month-end balance $ 7,458 $ 7,552 $ 8,178
Weighted-average rate at year-end 2.97% 3.14% 3.10%
Weighted-average rate during the year 3.15% 3.23% 3.40%