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Note 1 - Summary of Significant Accounting Policies - Recurring Fair Value Measurements (Details) - USD ($) | Jun. 30, 2020 | May 21, 2020
--- | --- | ---
Prefunded warrants | $ 2,811,900 | $ 2,575,000
Fair Value, Recurring [Member] |  |
Contingent Earn-out Liability | 901,537 |
Prefunded warrants | 2,811,900 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Contingent Earn-out Liability | 0 |
Prefunded warrants | 2,811,900 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Contingent Earn-out Liability | 0 |
Prefunded warrants | 0 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Contingent Earn-out Liability | 901,537 |
Prefunded warrants | $ 0 |

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