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Note 1 - Basis of Presentation (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Schedule of Cash and Cash Equivalents [Table Text Block] |
Nine months ended September 30, |  | 2021 |  |  | 2020 |
Cash, cash equivalents and restricted cash, beginning of period |  | $ | 437,648 |  |  | $ | 268,108 |
End of the period |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 464,049 |  |  |  | 388,024 |
Restricted cash |  |  | 1,512 |  |  |  | 1,512 |
Total cash, cash equivalents and restricted cash, end of period |  |  | 465,561 |  |  |  | 389,536 |
Net increase in cash, cash equivalents and restricted cash |  | $ | 27,913 |  |  | $ | 121,428 |

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