Note 6 - Income Taxes	3 Months Ended
Note 6 - Income Taxes	Mar. 31, 2020
Notes to Financial Statements
Income Tax Disclosure [Text Block]	6. 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 March 31, 2020 and December 31, 2019 , 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 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 three months ended March 31, 2020 and 2019 , the Company's effective income tax rate of 0% and 3% , respectively, differed from the statutory federal income tax rate of 21%, 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 March 31, 2020 and December 31, 2019 , 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 March 31, 2020 , 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. On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) was enacted and signed into law. The CARES Act includes several provisions for corporations, including increasing the amount of deductible interest, allowing companies to carryback certain Net Operating Losses (“NOLs”) and increasing the amount of NOLs that corporations can use to offset income. We are currently assessing the future implications of these provisions within the CARES Act on our consolidated financial statements, but do not expect the impact to be material.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.