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(11) Income Taxes (Tables)
12 Months Ended
Jun. 30, 2019
Income Tax Disclosure [Abstract]  
Schedule of components of income tax expense (benefit)
    Current     Deferred     Total  
2019:                  
U.S. federal   $ -     $ -   $ -
State and local     (5,474 )     -       (5,474 )
    $ (5,474 )   $ -   $ (5,474 )
2018:                        
U.S. federal   $ 71,930     $ -     $ 71,930  
State and local     (1,616 )     -       (1,616 )
    $ 70,314     $ -     $ 70,314  
Schedule of effective income tax rate reconciliation
     2019      2018  
Expected tax benefit   $ 183,655     $ 459,957  
State taxes, net of federal tax benefit     30,705       45,817  
Business tax credits     -       45,000  
Effect of corporate income tax rate change     -       (784,860 )
Valuation allowance     (237,690 )     332,193  
Incentive stock options     (8,812 )     (9,977 )
Other, net     26,668       (17,816 )
    $ (5,474 )   $ 70,314  
Schedule of deferred tax assets and liabilities
    2019     2018  
Net deferred income tax assets (liabilities):            
Inventory capitalization for income tax purposes   $ 86,197     $ 60,944  
Inventory reserve     36,024       119,181  
Accrued employee benefit reserve     90,536       93,496  
Warranty reserve     54,076       53,522  
Interest expense limitation     126,916       7,949  
Allowance for doubtful accounts     29,292       95,522  
Property and equipment, principally due to differences in depreciation     (151,146 )     (155,096 )
Research and development credit carryover     609,391       588,707  
Other intangibles     (205,549 )     (98,067 )
Deferred gain on sale lease-back     527,340       548,026  
Operating loss carry forwards     1,666,684       1,317,887  
Valuation allowance     (2,869,761 )     (2,632,071 )
Total deferred income tax assets (liabilities)   $ -   $ -