Statements of Income (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue
Product sales	$ 6,436,672	$ 8,113,806	$ 14,172,537	$ 16,461,887
Contract research and development	843,085	153,567	1,428,139	258,521
Total revenue	7,279,757	8,267,373	15,600,676	16,720,408
Cost of sales	1,644,514	1,609,632	3,638,442	3,167,978
Gross profit	5,635,243	6,657,741	11,962,234	13,552,430
Expenses
Selling, general, and administrative	524,631	625,599	1,009,395	1,255,249
Research and development	628,962	787,279	1,309,963	1,590,707
Total expenses	1,153,593	1,412,878	2,319,358	2,845,956
Income from operations	4,481,650	5,244,863	9,642,876	10,706,474
Interest income	468,531	562,923	954,329	1,111,477
Income before taxes	4,950,181	5,807,786	10,597,205	11,817,951
Provision for income taxes	1,639,386	1,932,164	3,483,184	3,905,219
Net income	$ 3,310,795	$ 3,875,622	$ 7,114,021	$ 7,912,732
Net income per share – basic (in dollars per share)	$ 0.68	$ 0.80	$ 1.46	$ 1.63
Net income per share – diluted (in dollars per share)	0.68	$ 0.80	1.46	$ 1.63
Cash dividends declared per common share (in dollars per share)	$ 1		$ 2
Weighted average shares outstanding
Basic (in shares)	4,855,398	4,855,071	4,858,557	4,853,068
Diluted (in shares)	4,858,133	4,872,029	4,862,431	4,868,769