Statements Of Income (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Revenue
Product sales	$ 5,883,690	$ 6,448,407	$ 22,345,577	$ 19,654,162
Contract research and development	408,058	25,290	666,579	297,648
Total revenue	6,291,748	6,473,697	23,012,156	19,951,810
Cost of sales	1,473,655	1,449,396	4,641,633	4,331,297
Gross profit	4,818,093	5,024,301	18,370,523	15,620,513
Expenses
Selling, general , and administrative	533,695	543,698	1,788,944	1,756,578
Research and development	694,758	905,246	2,285,465	2,744,620
Total expenses	1,228,453	1,448,944	4,074,409	4,501,198
Income from operations	3,589,640	3,575,357	14,296,114	11,119,315
Interest income	557,843	530,383	1,669,320	1,577,524
Income before taxes	4,147,483	4,105,740	15,965,434	12,696,839
Provision for income taxes	1,354,577	1,328,566	5,259,796	4,123,189
Net income	$ 2,792,906	$ 2,777,174	$ 10,705,638	$ 8,573,650
Net income per share - basic	$ 0.57	$ 0.57	$ 2.21	$ 1.77
Net income per share - diluted	$ 0.57	$ 0.57	$ 2.20	$ 1.76
Weighted average shares outstanding
Basic	4,857,953	4,842,565	4,854,702	4,852,356
Diluted	4,876,074	4,859,601	4,871,270	4,868,040