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Note 11 - Computation of Net Income Per Share - Basic & Diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Net income available for shareholders $ 3,991 $ 2,597 $ 1,826 $ 2,755 $ 2,239 $ 2,403 $ 3,060 $ 1,881 $ 3,462 $ 1,746 $ 1,932 $ 1,860 $ 11,169 $ 9,583 $ 9,000
Weighted average outstanding shares of common stock (in shares)                         3,605 3,521 3,445
Dilutive effect of stock options (in shares)                         152 129 166
Common stock and equivalents (in shares)                         3,757 3,650 3,611
Basic (in dollars per share) $ 1.10 $ 0.72 $ 0.51 $ 0.77 $ 0.63 $ 0.68 $ 0.87 $ 0.54 $ 1 $ 0.51 $ 0.57 $ 0.55 $ 3.10 $ 2.72 $ 2.61
Diluted (in dollars per share)                         $ 2.97 $ 2.63 $ 2.49