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Income Taxes - Deferred taxes (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Taxes |  |
Net operating loss carry forwards | $ 14,620,000 | $ 13,216,000
Accrued liabilities | 90,000 | 217,000
Stock compensation | 120,000 | (48,000)
Depreciation | (10,000) | 145,000
Prepaid expenses | 20,000 | (21,000)
Other | (10,000) | (4,000)
Deferred tax assets, net | 14,830,000 | 13,505,000
Valuation allowance | (14,830,000) | (13,505,000)
Net deferred tax asset | $ 0 | $ 0

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