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A reconciliation between taxes computed at the federal statutory rate and the consolidated effective tax rate is as follows: (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal statutory tax rate	21.00%	21.00%	34.00%
State tax rate, net of federal tax benefit	4.00%	5.20%	5.00%
Adjustment in valuation allowances	(22.50%)	(31.20%)	22.60%
Excess stock benefits	0.20%	5.30%
Federal income tax rate change	0.00%		(60.80%)
Permanent and other differences	(2.70%)	(0.30%)	(0.80%)
Provision (benefit) for income taxes	0.00%	0.00%	0.00%

X

- Definition

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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