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Quarterly Results (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	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, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Quarterly results
Revenues	$ 12,808	$ 11,361	$ 11,706	$ 10,560	$ 10,968	$ 9,649	$ 9,702	$ 9,297	$ 10,377	$ 8,000	$ 8,072	$ 7,778	$ 46,435	$ 39,616	$ 34,227
Gross profit	8,211	6,947	7,248	6,456	6,464	5,885	5,774	5,388	6,195	4,440	4,552	4,381	28,862	23,511	19,568
Net income	$ 2,559	$ 1,543	$ 2,248	$ 2,100	$ 2,199	$ 1,987	$ 2,054	$ 1,679	$ 2,176	$ 1,258	$ 1,429	$ 1,320	$ 8,450	$ 7,919	$ 6,183
Net Income per share - basic (in dollars per share)	$ 0.76	$ 0.46	$ 0.67	$ 0.63	$ 0.67	$ 0.60	$ 0.63	$ 0.51	$ 0.67	$ 0.39	$ 0.44	$ 0.41	$ 2.52	$ 2.41	$ 1.91
Net Income per share - diluted (in dollars per share)	$ 0.71	$ 0.44	$ 0.64	$ 0.59	$ 0.64	$ 0.57	$ 0.59	$ 0.49	$ 0.64	$ 0.37	$ 0.43	$ 0.40	$ 2.35	$ 2.29	$ 1.86

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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