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Note 11 - Net Income Per Share (Details) - Computation of Net Income per Share - Basic & Diluted (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Computation of Net Income per Share - Basic & Diluted [Abstract]                              
Net income available for stockholders (in Dollars) $ 3,462 $ 1,746 $ 1,932 $ 1,860 $ 2,559 $ 1,543 $ 2,248 $ 2,100 $ 2,199 $ 1,987 $ 2,054 $ 1,679 $ 9,000 $ 8,450 $ 7,919
Weighted average outstanding shares of common stock                         3,445 3,357 3,285
Dilutive effect of stock options                         166 236 177
Common stock and equivalents                         3,611 3,593 3,462
Net Income per share:                              
Basic (in Dollars per share) $ 1.00 $ 0.51 $ 0.57 $ 0.55 $ 0.76 $ 0.46 $ 0.67 $ 0.63 $ 0.67 $ 0.60 $ 0.63 $ 0.51 $ 2.61 $ 2.52 $ 2.41
Diluted (in Dollars per share) $ 0.95 $ 0.48 $ 0.54 $ 0.52 $ 0.71 $ 0.44 $ 0.64 $ 0.59 $ 0.64 $ 0.57 $ 0.59 $ 0.49 $ 2.49 $ 2.35 $ 2.29