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Note 13 - Income Tax (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Percent, Total | (3.70%) | (105.70%)
Deferred Tax Assets, Valuation Allowance | $ 14,506 | $ 14,700
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (200) | (2,000)
Research and Development Tax Credit Carryforwards Offset by Reserve for Uncertain Tax Positions | 800 |
Deferred Tax Assets, Tax Credit Carryforwards, Total | 2,700 |
Cash and Cash Equivalents, at Carrying Value, Total | 4,508 | 7,821
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 2,000 |
Non-US [Member] | Subsidiaries [Member] |  |
Cash and Cash Equivalents, at Carrying Value, Total | 2,600 | 2,800
Expire 2023 [Member] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Research | 8,100 |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 100 |
Expire 2036 [Member] | Research Tax Credit Carryforward [Member] |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount | $ 200 |
Domestic Tax Authority [Member] |  |
Open Tax Year | 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards | $ 13,400 |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Expire between 2029 and 2038 [Member] |  |
Operating Loss Carryforwards | 13,300 |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Indefinite Carryforward Beyond 2038 [Member] |  |
Operating Loss Carryforwards | 100 |
State and Local Jurisdiction [Member] | Expire between 2023 and 2042 [Member] |  |
Operating Loss Carryforwards | 9,600 |
Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards | $ 8,000 |
Open Tax Year | 2018 2019 2020 2021 2022 |
UK Pension Liability [Member] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | $ (900)

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3044-108585 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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