Statements of Income (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Revenue
Product sales	$ 5,025,041	$ 5,883,690	$ 19,197,578	$ 22,345,577
Contract research and development	990,974	408,058	2,419,113	666,579
Total revenue	6,016,015	6,291,748	21,616,691	23,012,156
Cost of sales	1,508,361	1,473,655	5,146,803	4,641,633
Gross profit	4,507,654	4,818,093	16,469,888	18,370,523
Expenses
Selling, general, and administrative	406,676	533,695	1,416,071	1,788,944
Research and development	738,657	694,758	2,048,620	2,285,465
Total expenses	1,145,333	1,228,453	3,464,691	4,074,409
Income from operations	3,362,321	3,589,640	13,005,197	14,296,114
Interest income	468,367	557,843	1,422,696	1,669,320
Income before taxes	3,830,688	4,147,483	14,427,893	15,965,434
Provision for income taxes	1,253,237	1,354,577	4,736,421	5,259,796
Net income	$ 2,577,451	$ 2,792,906	$ 9,691,472	$ 10,705,638
Net income per share – basic (in dollars per share)	$ 0.53	$ 0.57	$ 2	$ 2.21
Net income per share – diluted (in dollars per share)	0.53	$ 0.57	2	$ 2.20
Cash dividends declared per common share (in dollars per share)	$ 1		$ 3
Weighted average shares outstanding
Basic (in shares)	4,844,845	4,857,953	4,853,970	4,854,702
Diluted (in shares)	4,846,970	4,876,074	4,857,103	4,871,270