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Note 6 - Income Taxes (Details Textual) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 USD ($)
Deferred Tax Assets, Valuation Allowance, Total | $ 0
Internal Revenue Service (IRS) [Member] |
Open Tax Year | 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
Domestic Tax Authority [Member] |
Operating Loss Carryforwards, Total | $ 3,600
State and Local Jurisdiction [Member] |
Operating Loss Carryforwards, Subject to Expiration | 3,500
Foreign Tax Authority [Member] |
Operating Loss Carryforwards, Subject to Expiration | $ 2,800

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