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Note 4 - Convertible Notes Payable (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Convertible notes payable |
|  | December 31, 2020 |  |  | December 31, 2019 |
A. Notes payable issued for cash |  | $ | 24,085,000 |  |  | $ | 12,998,000 |
B. Notes payable issued for settlement agreements |  |  | 2,528,000 |  |  |  | 300,000 |
C. Notes payable issued for forbearance agreements |  |  | 3,849,000 |  |  |  | - |
D. Notes payable issued for consulting services |  |  | 360,000 |  |  |  | - |
|  |  | 30,822,000 |  |  |  | 13,298,000 |
Less unamortized debt discount |  |  | (4,519,000 | ) |  |  | (91,000 | )
Convertible notes, net of discount |  | $ | 26,303,000 |  |  | $ | 13,207,000 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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Balance Type: | na
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration