| Note 6 - Income Taxes (Details Textual) | Sep. 30, 2021  USD ($) | 
|---|---|
| Deferred Tax Assets, Valuation Allowance, Total | $ 0 | 
| Domestic Tax Authority [Member] | |
| Operating Loss Carryforwards, Total | 603,000 | 
| State and Local Jurisdiction [Member] | |
| Operating Loss Carryforwards, Subject to Expiration | 427,000 | 
| Foreign Tax Authority [Member] | |
| Operating Loss Carryforwards, Subject to Expiration | $ 2,800,000 | 
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- Definition Amount of operating loss carryforward subject to expiration, before tax effects, available to reduce future taxable income under enacted tax laws. No definition available. 
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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| X | ||||||||||
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- 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 | ||||||||||
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- Details 
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