Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Income Taxes
Expected tax credit	$ (297)	$ (234)
State income taxes, net of federal tax benefits	(56)	(45)
Decrease in environmental liability	0	0
Increase (decrease) in valuation allowance	353	279
Income tax expense benefit continuing operations	$ 0	$ 0
Expected tax (credit), percentage	21.00%	21.00%
State income taxes, net of federal tax benefits, percentage	4.00%	4.00%
Decrease in environmental liability, percentage	0.00%	0.00%
Increase (decrease) in valuation allowance percentage	25.00%	25.00%
Effective income tax rate continuing operations	0.00%	0.00%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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