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Statements of Income (Unaudited) - USD ($)
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Revenue    
Revenue $ 4,589,262 $ 6,294,696
Cost of sales 836,422 1,092,037
Gross profit 3,752,840 5,202,659
Expenses    
Research and development 880,983 973,067
Selling, general, and administrative 355,011 330,009
Total expenses 1,235,994 1,303,076
Income from operations 2,516,846 3,899,583
Interest income 399,212 459,039
Income before taxes 2,916,058 4,358,622
Provision for income taxes 504,193 751,203
Net income $ 2,411,865 $ 3,607,419
Net income per share – basic (in dollars per share) $ 0.50 $ 0.74
Net income per share – diluted (in dollars per share) 0.50 0.74
Cash dividends declared per common share (in dollars per share) $ 1 $ 1
Weighted average shares outstanding    
Basic (in shares) 4,835,038 4,846,010
Diluted (in shares) 4,835,157 4,850,388
Product [Member]    
Revenue    
Revenue $ 4,358,635 $ 6,085,364
Contract Research and Development [Member]    
Revenue    
Revenue $ 230,627 $ 209,332