Statements of Income (Unaudited) - USD ($)	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Revenue
Product sales	$ 7,735,865	$ 8,348,081
Contract research and development	585,054	104,954
Total revenue	8,320,919	8,453,035
Cost of sales	1,993,928	1,558,346
Gross profit	6,326,991	6,894,689
Selling, general, and administrative	484,764	629,650
Research and development	681,001	803,428
Total expenses	1,165,765	1,433,078
Income from operations	5,161,226	5,461,611
Interest income	485,798	548,554
Income before taxes	5,647,024	6,010,165
Provision for income taxes	1,843,798	1,973,055
Net income	$ 3,803,226	$ 4,037,110
Net income per share – basic (in dollars per share)	$ 0.78	$ 0.83
Net income per share – diluted (in dollars per share)	0.78	$ 0.83
Cash dividends declared per common share (in dollars per share)	$ 1
Basic (in shares)	4,854,841	4,851,043
Diluted (in shares)	4,860,848	4,867,459