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8. Income Taxes (Details 2) - USD ($) | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Deferred income tax assets: |  |
Inventories | $ 132,511 | $ 165,225
Accounts receivable | 143,780 | 235,207
Intangible assets | 0 | 25,738
Accrued expenses | 36,621 | 44,112
Net operating loss and tax credit carry forwards | 17,863,473 | 17,977,742
Plant and equipment | 4,629 | 15,018
Stock compensation | 90,504 | 89,515
Other- investment impairments | 127,855 | 127,855
Total deferred income tax assets | 18,399,373 | 18,680,412
Valuation allowance | (18,399,373) | (18,680,412)
Net deferred tax assets | $ 0 | $ 0

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