| Note 4 - Prepaid Expenses (Tables) | 9 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||
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| Sep. 30, 2021 | ||||||||||||||||||||||||||||||||||||||||||||||
| Notes Tables | ||||||||||||||||||||||||||||||||||||||||||||||
| Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] | 
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- Definition Tabular disclosure of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer; the aggregate carrying amount of current assets, not separately presented elsewhere in the balance sheet; and other deferred costs. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- References No definition available. 
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