v3.21.2

Note 2 - Summary of Significant Accounting Policies - Stock-based Compensation Expense (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
General and Administrative Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expense | $ 1,774,800 | $ 1,790,106 | $ 4,180,236 | $ 2,072,058
Selling and Marketing Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expense | 252,318 | 218,793 | 916,781 | 260,075
Research and Development Expense [Member] |  |  |  |
Share-based Payment Arrangement, Expense | $ 166,751 | $ 42,242 | $ 864,526 | $ 134,179

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