Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
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| Unrecognized Tax Benefits, Ending Balance | $ 0 | $ 0 |
| Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | 0 | |
| Domestic Tax Authority [Member] | ||
| Operating Loss Carryforwards, Total | $ 1,500 | 0 |
| Open Tax Year | 2018 2019 2020 | |
| State and Local Jurisdiction [Member] | ||
| Operating Loss Carryforwards, Total | $ 3,200 | $ 2,300 |
| State and Local Jurisdiction [Member] | Illinois Department of Revenue [Member] | ||
| Open Tax Year | 2017 2018 2019 2020 | |
| State and Local Jurisdiction [Member] | Wisconsin Department of Revenue [Member] | ||
| Open Tax Year | 2017 2018 2019 2020 |
| X | ||||||||||
- Definition Tax year that remains open to examination under enacted tax laws, in YYYY format. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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