Statements of Income (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Revenue
Product sales	$ 6,448,831	$ 7,116,931	$ 19,718,584	$ 19,782,529
Contract research and development	911,958	345,748	2,246,105	1,690,461
Total revenue	7,360,789	7,462,679	21,964,689	21,472,990
Cost of sales	1,657,700	1,502,848	4,809,235	4,628,840
Gross profit	5,703,089	5,959,831	17,155,454	16,844,150
Expenses
Selling, general, and administrative	313,033	384,322	1,060,757	1,117,925
Research and development	852,739	826,816	2,788,968	2,353,372
Total expenses	1,165,772	1,211,138	3,849,725	3,471,297
Income from operations	4,537,317	4,748,693	13,305,729	13,372,853
Interest income	404,665	395,207	1,154,303	1,263,924
Income before taxes	4,941,982	5,143,900	14,460,032	14,636,777
Provision for income taxes	1,370,380	1,660,156	4,429,780	4,715,291
Net income	$ 3,571,602	$ 3,483,744	$ 10,030,252	$ 9,921,486
Net income per share – basic (in dollars per share)	$ 0.74	$ 0.72	$ 2.07	$ 2.05
Net income per share – diluted (in dollars per share)	0.74	0.72	2.07	2.05
Cash dividends declared per common share (in dollars per share)	$ 1	$ 1	$ 3	$ 3
Weighted average shares outstanding
Basic (in shares)	4,841,369	4,836,336	4,841,130	4,835,639
Diluted (in shares)	4,847,290	4,839,777	4,846,036	4,837,815