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Income Taxes (Details 1) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets (liabilities): |  |
Inventories | $ 27,122 | $ 104,190
Stock options and other | 58,050 | 93,985
Alternative Minimum Tax credit carryforward | 1,703 | 24,674
Contingencies and accruals | 81,907 | 152,846
Property and equipment | (228,460) | (214,383)
Net operating loss carryforward | 7,376,283 | 12,174,859
Total deferred tax assets, net | 7,316,605 | 12,336,171
Valuation allowance | $ 7,316,605 | $ (12,336,171)

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