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Note 20 - Selected Quarterly Financial Data (Unaudited) (Detail) - Selected Quarterly Financial Data (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Total interest income $ 6,949 $ 7,342 $ 7,223 $ 7,232 $ 7,419 $ 7,528 $ 7,421 $ 7,359      
Total interest expense 1,513 1,602 1,646 1,686 1,873 2,134 2,304 2,341 6,447 8,652 10,945
Net interest income 5,436 5,740 5,577 5,546 5,546 5,394 5,117 5,018 22,299 21,075 18,149
Provision for loan losses 975 143 450 600 600 920 700 865      
Net interest income after provision for loan losses 4,461 5,597 5,127 4,946 4,946 4,474 4,417 4,153 20,131 17,990 14,569
Total noninterest income 772 868 1,017 794 258 686 594 699 3,451 2,237 2,623
Total noninterest expense 3,694 4,122 4,041 3,782 3,598 3,906 4,292 3,705 15,639 15,501 14,763
Income before income taxes 1,539 2,343 2,103 1,958 1,606 1,254 719 1,147 7,943 4,726 2,429
Income taxes 270 494 463 435 277 175 (1) 145 1,662 596 (88)
Net income $ 1,269 $ 1,849 $ 1,640 $ 1,523 $ 1,329 $ 1,079 $ 720 $ 1,002 $ 6,281 $ 4,130 $ 2,517
Net income                      
Basic (in Dollars per share) $ 0.65 $ 0.93 $ 0.85 $ 0.86 $ 0.76 $ 0.63 $ 0.44 $ 0.62 $ 3.29 $ 2.45 $ 1.60
Diluted (in Dollars per share) $ 0.64 $ 0.93 $ 0.85 $ 0.86 $ 0.76 $ 0.63 $ 0.44 $ 0.62 $ 3.28 $ 2.45 $ 1.60
Average shares outstanding:                      
Basic (in Shares) 1,984,818 1,978,181 1,919,333 1,763,982 1,756,157 1,704,677 1,647,771 1,621,889 1,911,960 1,683,052 1,575,213
Diluted (in Shares) 1,991,354 1,983,863 1,921,205 1,764,585 1,756,157 1,704,677 1,647,920 1,651,889 1,916,932 1,683,052 1,575,821