Note 8 - Income Taxes	3 Months Ended
Note 8 - Income Taxes	Mar. 31, 2020
Notes to Financial Statements
Income Tax Disclosure [Text Block]	8. INCOME TAXES Our effective tax rate for the three -month periods ended March 31, 2020 and March 31, 2019 was 22.9% and 8.4%, respectively. The period-over-period change was primarily attributable to discrete tax benefits realized on disqualifying dispositions of incentive stock options exercised by employees during the three -month period ended March 31, 2019. As of December 31, 2019, we have domestic net operating loss (“NOL”) carryforwards of $58,400, which expire 2020 thru 2035, and domestic tax credits of $1,907, which expire 2028 thru 2039, available to reduce future taxable income. As of March 31, 2020, Management has concluded it is more likely than not that these domestic NOL and credit carryforwards will be fully utilized. As of March 31, 2020, for certain past operations in the U.K., we continue to report a valuation allowance for NOL carryforwards of approximately $10,000, nearly all of which can be carried forward indefinitely. Utilization of the net operating losses may be limited due to the change in the past U.K. operation and cannot currently be used to reduce taxable income at our other U.K. subsidiary, Accutronics Ltd. As of March 31, 2020, we have not recognized a valuation allowance against our other foreign deferred tax assets, as realization is considered to be more likely than not. As of March 31, 2020, the Company maintains its assertion that all foreign earnings will be indefinitely reinvested in those operations. There were no unrecognized tax benefits related to uncertain tax positions at March 31, 2020 and December 31, 2019. As a result of our operations, we file income tax returns in various jurisdictions including U.S. federal, U.S. state and foreign jurisdictions. We are routinely subject to examination by taxing authorities in these various jurisdictions. Our U.S. tax matters for the years 2000 through 2019 remain subject to examination by the Internal Revenue Service (“IRS”) due to our net operating loss carryforwards. Our U.S. tax matters for the years 2000 through 2019 remain subject to examination by various state and local tax jurisdictions due to our net operating loss carryforwards. Our tax matters for the years 2010 through 2019 remain subject to examination by the respective foreign tax jurisdiction authorities.

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.