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(11) Income Taxes (Tables)
12 Months Ended
Jun. 30, 2018
Table Text Block Supplement [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
    Current     Deferred     Total  
2018:                  
U.S. federal   $ 71,930     $ -     $ 71,930  
State and local     (1,616 )     -       (1,616 )
    $ 70,314     $ -     $ 70,314  
2017:                        
U.S. federal   $ -     $ -     $ -  
State and local     -       -       -  
    $ -     $ -     $ -  
Schedule of Effective Income Tax Rate Reconciliation
     2018      2017  
Expected tax benefit   $ 459,957     $ 634,574  
State taxes, net of federal tax benefit     45,817       57,176  
Business tax credits     45,000       40,000  
Effect of corporate income tax rate change     (784,860 )     -  
Valuation allowance     332,193       (772,288 )
Incentive stock options     (9,977 )     (11,284 )
Other, net     (17,816 )     51,822  
    $ 70,314     $ -  
Schedule of Deferred Tax Assets and Liabilities
    2018     2017  
Net deferred income tax assets (liabilities):            
Inventory capitalization for income tax purposes   $ 60,944     $ 92,681  
Inventory reserve     119,181       157,068  
Accrued employee benefit reserve     93,496       -  
Warranty reserve     53,522       78,780  
Accrued product liability and other     7,949       9,103  
Allowance for doubtful accounts     95,522       149,110  
Property and equipment, principally due to differences in depreciation     (155,096 )     (103,308 )
Research and development credit carryover     588,707       351,903  
Other intangibles     (98,067 )     (45,256 )
Deferred gain on sale lease-back     548,026       846,061  
Operating loss carry forwards     1,317,887       1,428,119  
Valuation allowance     (2,632,071 )     (2,964,261 )
Total deferred income tax assets (liabilities)   $ -     $ -