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Condensed Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Condensed Statements of Income
Revenue	$ 11,218	$ 10,559
Cost of revenues	4,421	4,104
Gross profit	6,797	6,455
Operating expenses
Selling	1,083	1,002
General and administrative	2,086	1,854
Research and development	585	380
Total operating expenses	3,754	3,236
Operating income	3,043	3,219
Other expense, net	28	34
Earnings before income taxes	3,015	3,185
Income taxes	1,155	1,086
Net income	$ 1,860	$ 2,099
Net income per share:
Basic (in dollars per share)	$ 0.55	$ 0.63
Diluted (in dollars per share)	$ 0.52	$ 0.59
Weighted average common shares outstanding:
Basic (in shares)	3,394	3,337
Diluted (in shares)	3,553	3,541

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