Statements of Income (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Revenue
Product sales	$ 7,116,931	$ 5,025,041	$ 19,782,529	$ 19,197,578
Contract research and development	345,748	990,974	1,690,461	2,419,113
Total revenue	7,462,679	6,016,015	21,472,990	21,616,691
Cost of sales	1,502,848	1,508,361	4,628,840	5,146,803
Gross profit	5,959,831	4,507,654	16,844,150	16,469,888
Expenses
Selling, general, and administrative	384,322	406,676	1,117,925	1,416,071
Research and development	826,816	738,657	2,353,372	2,048,620
Total expenses	1,211,138	1,145,333	3,471,297	3,464,691
Income from operations	4,748,693	3,362,321	13,372,853	13,005,197
Interest income	395,207	468,367	1,263,924	1,422,696
Income before taxes	5,143,900	3,830,688	14,636,777	14,427,893
Provision for income taxes	1,660,156	1,253,237	4,715,291	4,736,421
Net income	$ 3,483,744	$ 2,577,451	$ 9,921,486	$ 9,691,472
Net income per share – basic (in dollars per share)	$ 0.72	$ 0.53	$ 2.05	$ 2
Net income per share – diluted (in dollars per share)	0.72	0.53	2.05	2
Cash dividends declared per common share (in dollars per share)	$ 1	$ 1	$ 3	$ 3
Weighted average shares outstanding
Basic (in shares)	4,836,336	4,844,845	4,835,639	4,853,970
Diluted (in shares)	4,839,777	4,846,970	4,837,815	4,857,103