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Note 14 - Quarterly Results (unaudited) (Details) - Quarterly Financial Information (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
Quarterly Financial Information [Abstract]                              
Revenues $ 15,714 $ 13,116 $ 12,676 $ 11,218 $ 12,808 $ 11,361 $ 11,706 $ 10,560 $ 10,968 $ 9,649 $ 9,702 $ 9,297 $ 52,724 $ 46,435 $ 39,616
Gross profit 9,585 7,706 7,600 6,797 8,211 6,947 7,248 6,456 6,464 5,885 5,774 5,388 31,688 28,862 23,511
Net income $ 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
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
Net Income per share – 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