Quarterly Financial Data (unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Schedule Of Quarterly Financial Information [Line Items]
Net sales	$ 8,677,000	$ 8,467,000	$ 8,719,000	$ 7,897,000	$ 8,222,000	$ 8,581,000	$ 8,269,000	$ 8,440,000	$ 33,759,953	$ 33,512,030	$ 35,952,487
Gross profit	1,951,000	1,233,000	1,909,000	1,357,000	1,569,000	1,735,000	1,695,000	1,557,000	6,450,442	6,555,690	7,359,735
Loss from operations	(97,000)	(888,000)	(244,000)	(767,000)	(459,000)	(403,000)	(373,000)	(817,000)	(1,995,614)	(2,051,894)	(1,919,326)
Net loss	$ (143,000)	$ (901,000)	$ (381,000)	$ (767,000)	$ (495,000)	$ (403,000)	$ (375,000)	$ (816,000)	$ (2,192,170)	$ (2,088,666)	$ (2,304,831)
Basic loss per share	$ (0.04)	$ (0.22)	$ (0.09)	$ (0.19)	$ (0.13)	$ (0.10)	$ (0.09)	$ (0.20)	$ (0.55)	$ (0.52)	$ (0.57)
Diluted loss per share	$ (0.04)	$ (0.22)	$ (0.09)	$ (0.19)	$ (0.13)	$ (0.10)	$ (0.09)	$ (0.20)	$ (0.55)	$ (0.52)	$ (0.57)