Statements of Income (USD $)	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Revenue
Product sales	$ 7,023,274	$ 6,193,876
Contract research and development	1,190,488	1,047,418
Total revenue	8,213,762	7,241,294
Cost of sales	2,595,592	2,075,804
Gross profit	5,618,170	5,165,490
Expenses
Selling, general , and administrative	615,830	628,386
Research and development	494,876	341,663
Total expenses	1,110,706	970,049
Income from operations	4,507,464	4,195,441
Interest income	565,529	475,730
Income before taxes	5,072,993	4,671,171
Provision for income taxes	1,633,765	1,570,074
Net income	$ 3,439,228	$ 3,101,097
Net income per share - basic	$ 0.72	$ 0.66
Net income per share - diluted	$ 0.70	$ 0.64
Weighted average shares outstanding
Basic	4,776,198	4,700,583
Diluted	4,893,915	4,861,331