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Provision for Income Taxes (Schedule of Deferred Tax Assets And Liabilities) (Details) - USD ($)
Jun. 30, 2020
Jun. 30, 2019
Deferred tax assets:    
Accrued expenses $ 171,880 $ 164,388
ESOP 17,702
Stock-based compensation 56,280 56,382
Inventory - effect of uniform capitalization 74,352 64,148
Other 1,437 1,437
Total deferred tax assets 303,949 304,057
Deferred tax liability:    
Property, plant and equipment - principally due to differences in depreciation methods 503,009 541,150
Prepaid expenses 33,893 39,982
Total deferred tax liability 536,902 581,132
Net deferred tax liability $ (232,953) $ (277,075)