Statements of Income (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Sales	$ 3,317,370	$ 3,344,374	$ 9,777,086	$ 10,666,525
Costs and expenses:
Cost of sales	1,386,948	1,197,448	4,142,616	4,101,973
Operating expenses	544,176	519,330	1,593,232	1,577,864
Research and development	104,800	98,301	297,304	291,250
Total costs and expenses	2,035,924	1,815,079	6,033,152	5,971,087
Income from operations	1,281,446	1,529,295	3,743,934	4,695,438
Other Income (expense):
Investment income	47,320	38,048	141,428	142,607
Net gain (loss) on marketable securities	25,499	99,145	369,542	(54,261)
Loss on trade-in of equipment				(12,837)
Total other income	72,819	137,193	510,970	75,509
Income before provision for income taxes	1,354,265	1,666,488	4,254,904	4,770,947
Provision for income taxes	284,394	349,964	883,529	1,001,899
Net Income	$ 1,069,871	$ 1,316,524	$ 3,371,375	$ 3,769,048
Earnings per common share
(Basic and Diluted) (in dollars per share)	$ 0.23	$ 0.29	$ 0.73	$ 0.82
Weighted average shares – basic and diluted (in shares)	4,594,319	4,594,319	4,594,319	4,594,319