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Note 2 - Summary of Significant Accounting Policies - Fair Value of Financial Assets (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Investment | $ 0 | $ 335,000
Marketable Securities [Member] |  |
Assets: |  |
Investment |  | 335,000
Marketable Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Investment |  | 335,000
Marketable Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Investment |  |
Marketable Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Investment |  |

X
- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References No definition available. + Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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- Details
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- Details
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Balance Type: |
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