Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Condensed Consolidated Statements of Operations [Abstract]
Net sales	$ 4,929,789	$ 4,162,659	$ 10,138,084	$ 9,573,421
Cost of goods sold	3,311,892	2,798,572	6,883,960	6,861,880
Gross profit	1,617,897	1,364,087	3,254,124	2,711,541
Selling, general and administrative expenses	1,615,824	1,586,705	3,121,595	3,251,305
Income (loss) from operations	2,073	(222,618)	132,529	(539,764)
Other income	506,700		506,700
Interest income	2,660	6,927	609	13,324
Income (loss) before income tax provision	511,433	(215,691)	639,838	(526,440)
Income tax provision	2,543	22	4,019	22
Net income (loss)	$ 508,890	$ (215,713)	$ 635,819	$ (526,462)
Income (loss) per common share:
Basic (in dollars per share)	$ 0.07	$ (0.03)	$ 0.09	$ (0.07)
Diluted (in dollars per share)	$ 0.07	$ (0.03)	$ 0.09	$ (0.07)
Weighted-average number of shares:
Basic (in shares)	7,405,758	7,404,831	7,405,295	7,404,831
Diluted (in shares)	7,453,450	7,404,831	7,424,239	7,404,831