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Income Taxes - Deferred taxes (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Income Taxes |  |
Net operating loss carry forwards | $ 13,216,000 | $ 11,540,000
Accrued liabilities | 217,000 | 280,000
Stock compensation | (48,000) | (50,000)
Depreciation | 145,000 | 160,000
Prepaid expenses | (21,000) | (20,000)
Other | (4,000) |
Deferred tax assets, net | 13,505,000 | 11,910,000
Valuation allowance | $ (13,505,000) | $ (11,910,000)

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