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Income Taxes - Deferred taxes (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
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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