Note 12 - Income Taxes - Reconciling Items from Income Tax Computed at the Statutory Federal Rate (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Federal income tax at statutory rate	21.00%	21.00%
State income taxes, net of federal benefits	7.00%	6.20%
Impact of change in statutory tax rates	(0.20%)	(8.80%)
Permanent deductions	(0.10%)	(3.70%)
Valuation allowance	(27.70%)	(14.70%)
Effective tax rate

The amount of effective income tax rate reconciliation, permanent differences.

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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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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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