STATEMENTS OF INCOME (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Revenue
Product sales	$ 6,366,009	$ 7,200,385	$ 22,183,223	$ 24,787,885
Contract research and development	390,251	201,293	537,727	668,024
Total revenue	6,756,260	7,401,678	22,720,950	25,455,909
Cost of sales	1,355,067	1,478,372	5,034,556	5,533,000
Gross profit	5,401,193	5,923,306	17,686,394	19,922,909
Expenses
Research and development	540,895	700,609	1,920,095	1,972,505
Selling, general, and administrative	389,311	403,449	1,298,211	1,210,395
Total expenses	930,206	1,104,058	3,227,820	3,182,900
Provision for credit losses			9,514	0
Income from operations	4,470,987	4,819,248	14,458,574	16,740,009
Interest income	491,671	406,092	1,440,289	1,040,528
Income before taxes	4,962,658	5,225,340	15,898,863	17,780,537
Provision for income taxes	778,236	994,016	2,587,145	3,318,723
Net income	$ 4,184,422	$ 4,231,324	$ 13,311,718	$ 14,461,814
Net income per share - basic	$ 0.87	$ 0.88	$ 2.75	$ 2.99
Net income per share - diluted	0.87	0.88	2.75	2.99
Cash dividends declared per common share	$ 1.00	$ 1.00	$ 3.00	$ 3.00
Weighted average shares outstanding
Weighted Average Number of Shares Outstanding, Basic	4,833,401	4,830,826	4,832,992	4,830,826
Weighted Average Number of Shares Outstanding, Diluted	4,837,230	4,832,368	4,839,725	4,831,168