CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) [Abstract]
Revenues	$ 47,477	$ 43,169
Cost of revenues	23,605	22,277
Gross profit	23,872	20,892
Operating expenses:
Research and development	3,947	3,173
Sales and marketing	9,578	10,028
General and administrative	2,908	3,055
Total operating expenses	16,433	16,256
Income from operations	7,439	4,636
Interest and other income (expense), net	47	404
Income before income tax provision	7,486	5,040
Income tax provision	2,771	1,811
Net income	$ 4,715	$ 3,229
Net income per share:
Basic net income per share (in dollars per share)	$ 0.21	$ 0.15
Diluted net income per share (in dollars per share)	$ 0.21	$ 0.14
Shares used in the calculation of net income per share:
Weighted average common shares outstanding - basic (in shares)	22,408,000	22,229,000
Weighted average common shares outstanding - diluted (in shares)	22,637,000	22,571,000
Cash dividends declared per share (in dollars per share)	$ 0.10	$ 0