Statements of Income (Unaudited) - USD ($)	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Revenue
Product sales	$ 5,851,214	$ 7,735,865
Contract research and development	856,558	585,054
Total revenue	6,707,772	8,320,919
Cost of sales	1,385,178	1,993,928
Gross profit	5,322,594	6,326,991
Expenses
Selling, general, and administrative	389,915	484,764
Research and development	758,368	681,001
Total expenses	1,148,283	1,165,765
Income from operations	4,174,311	5,161,226
Interest income	437,734	485,798
Income before taxes	4,612,045	5,647,024
Provision for income taxes	1,479,500	1,843,798
Net income	$ 3,132,545	$ 3,803,226
Net income per share – basic (in dollars per share)	$ 0.65	$ 0.78
Net income per share – diluted (in dollars per share)	0.65	0.78
Cash dividends declared per common share (in dollars per share)	$ 1	$ 1
Weighted average shares outstanding
Basic (in shares)	4,835,010	4,854,841
Diluted (in shares)	4,837,095	4,860,848