Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) |
Mar. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Notes Payable, Fair Value Disclosure | $ 191,000 | $ 745,000 |
| X | ||||||||||
- Definition Fair value portion of notes payable. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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