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Note 10 - Income Taxes (Details Textual) | 12 Months Ended
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Dec. 31, 2022 USD ($)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 33,000
State and Local Jurisdiction [Member] |
Open Tax Year | 2018 2019 2020 2021 2022
Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member] |
Operating Loss Carryforwards | $ 1,400,000
Open Tax Year | 2019 2020 2021 2022
Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member] |
Tax Credit Carryforward, Amount | $ 1,700,000
The Danish Ministry of Taxation [Member] | Foreign Tax Authority [Member] |
Operating Loss Carryforwards | $ 700,000

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