Income Taxes - Summary of deferred tax assets and liabilities recorded on the balance sheet (Details) - USD ($)	Jun. 30, 2020	Jun. 30, 2019
Deferred tax assets
Bad debts	$ 25,500	$ 25,500
Intangible assets	1,340	1,935
Accrued liabilities	491,605	262,970
Stock options	25,276	28,568
Net operating loss and credit carryforwards	3,807,811	3,914,655
Total Assets	4,351,532	4,233,628
Deferred tax liabilities
Prepaid expenses	10,587	10,937
Inventory	614,184	652,251
Depreciation	194,920	233,142
Other	116,007	99,575
Total Liabilities	935,698	995,905
Valuation Allowance	(2,775,069)	(2,735,832)
Total deferred taxes	$ 640,765	$ 501,891