Note 10 - Income taxes

On December 22, 2017, the President signed the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act, among other things, lowered the U.S. corporate income tax rate from 35% to 21% effective January 1, 2018. Consequently, we wrote down our net deferred tax liability as of October 31, 2017 by $41,000 to reflect the estimated impact of the Tax Act. While we have substantially completed our provisional analysis of the income tax effects of the Tax Act and recorded a reasonable estimate of such effects, the net one-time charge related to the Tax Act may differ, possibly materially, due to, among other things, further refinement of our calculations, changes in interpretations and assumptions that we have made, additional guidance that may be issued by the U.S. Government, and actions and related accounting policy decisions we may take as a result of the Tax Act. We will complete our analysis over a one-year measurement period ending December 22, 2018, and any adjustments during this measurement period will be included in net earnings from continuing operations as an adjustment to income tax expense in the reporting period when such adjustments are determined.

The Company uses an estimated annual effective tax rate, which is based on expected annual income, statutory tax rates and tax planning opportunities available in the various jurisdictions in which the Company operates, to determine its quarterly provision (benefit) for income taxes. Certain significant or unusual items are separately recognized in the quarter in which they occur and can be a source of variability in the effective tax rates from quarter to quarter.

The provision ( benefit) for income taxes was 18% and 30% of income (loss) before income taxes for the three months ended January 31, 2018 and 2017, respectively. The decrease in the effective income tax rate from period to period was primarily driven by the reduction of the federal corporate income tax rate due to the Tax Act resulting in the recognition of a benefit of $41,000, recognition of a stock option windfall benefit of $19,000 related to the exercise of NQSOs and the benefit of R&D credits.The Company recorded income from discontinued operations, net of tax, as disclosed in Note 2.

The total amount of unrecognized tax benefits was $0 as of January 31, 2018 and October 31, 2017. The total balance of accrued interest and penalties related to uncertain tax positions was $0 as of January 31, 2018 and October 31, 2017. The Company recognizes interest and penalties related to uncertain tax positions, if any, as a component of income tax expense and the accrued interest and penalties, if any, are included in deferred and other long-term liabilities in the Company's condensed consolidated balance sheets. There were no material interest or penalties included in income tax expense for the three months ended January 31, 2018 or 2017.