Note 8 - Income Taxes	9 Months Ended
Sep. 30, 2019
Notes to Financial Statements
Income Tax Disclosure [Text Block]	8. Income taxes The Company is subject to federal and state income taxes in the United States. The tax provision for interim periods is determined using an estimate of the Company's annual effective tax rate. The Company updates its estimated annual effective tax rate on a quarterly basis and, if the estimate changes, makes a cumulative adjustment. As of September 30, 2019 and December 31, 2018 , the Company has recorded a full valuation allowance against net deferred tax assets, and intends to continue maintaining a full valuation allowance on these net deferred tax assets until there is sufficient evidence to support the release of all or some portion of these allowances. Based on current income from continuing operations and anticipated future earnings, the Company believes there is a reasonable possibility that within the next twelve months sufficient positive evidence may become available to allow a conclusion to be reached that a significant portion, if not all, of the valuation allowance will be released. Release of some or all of the valuation allowance would result in the recognition of certain deferred tax assets and an increase in deferred tax benefit for any period in which such a release may be recorded, however, the exact timing and amount of any valuation allowance release are subject to change, depending upon the level of profitability that the Company is able to achieve and the net deferred tax assets available. For the nine months ended September 30, 2019 and 2018 , the Company's effective income tax benefit rate of 1% and 0% , respectively, differed from the statutory federal income tax rates of 21% and 34%, respectively, with such differences resulting primarily from the application of the full valuation allowance against the Company's deferred tax assets. The Company assesses its income tax positions and records tax benefits for all years subject to examination based upon its evaluation of the facts, circumstances and information available at the reporting dates. For those tax positions where it is more-likely-than- not that a tax benefit will be sustained, the Company has recorded the largest amount of tax benefit with a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is not more-likely-than- not that a tax benefit will be sustained, no tax benefit has been recognized in the Company's financial statements. As of September 30, 2019 and December 31, 2018 , the balance of unrecognized tax benefits was $1,480 . The unrecognized tax benefits, if recognized, would result in an increase to net operating losses that would be subject to a valuation allowance and, accordingly, result in no impact to the Company’s annual effective tax rate. As of September 30, 2019 , the Company has not accrued any interest or penalties with respect to its uncertain tax positions. The Company does not anticipate a significant increase or reduction in unrecognized tax benefits within the next twelve months.

Income taxes

The Company is subject to federal and state income taxes in the United States. The tax provision for interim periods is determined using an estimate of the Company's annual effective tax rate. The Company updates its estimated annual effective tax rate on a quarterly basis and, if the estimate changes, makes a cumulative adjustment.

As of

September 30, 2019

and

December 31, 2018

, the Company has recorded a full valuation allowance against net deferred tax assets, and intends to continue maintaining a full valuation allowance on these net deferred tax assets until there is sufficient evidence to support the release of all or some portion of these allowances. Based on current income from continuing operations and anticipated future earnings, the Company believes there is a reasonable possibility that within the next

twelve

months sufficient positive evidence

may

become available to allow a conclusion to be reached that a significant portion, if

not

all, of the valuation allowance will be released. Release of some or all of the valuation allowance would result in the recognition of certain deferred tax assets and an increase in deferred tax benefit for any period in which such a release

may

be recorded, however, the exact timing and amount of any valuation allowance release are subject to change, depending upon the level of profitability that the Company is able to achieve and the net deferred tax assets available.

For the

nine

months ended

September 30, 2019

and

2018

, the Company's effective income tax benefit rate of

and

, respectively, differed from the statutory federal income tax rates of

21%

and

34%,

respectively, with such differences resulting primarily from the application of the full valuation allowance against the Company's deferred tax assets.

The Company assesses its income tax positions and records tax benefits for all years subject to examination based upon its evaluation of the facts, circumstances and information available at the reporting dates. For those tax positions where it is more-likely-than-

not

that a tax benefit will be sustained, the Company has recorded the largest amount of tax benefit with a greater than

50%

likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is

not

more-likely-than-

not

that a tax benefit will be sustained,

tax benefit has been recognized in the Company's financial statements.

As of

September 30, 2019

and

December 31, 2018

, the balance of unrecognized tax benefits was

$1,480

. The unrecognized tax benefits, if recognized, would result in an increase to net operating losses that would be subject to a valuation allowance and, accordingly, result in

impact to the Company’s annual effective tax rate. As of

September 30, 2019

, the Company has

not

accrued any interest or penalties with respect to its uncertain tax positions.

The Company does

not

anticipate a significant increase or reduction in unrecognized tax benefits within the next

twelve

months.