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Note 2 - Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Schedule of Cash and Cash Equivalents [Table Text Block] |
|  | June 30, |  |  | June 30, |
|  | 2022 |  |  | 2021 |
Cash |  | $ | 23,298 |  |  | $ | 36,194 |
Cash equivalents |  |  | 8,010 |  |  |  | — |
Restricted cash and cash equivalents included in current assets |  |  | 1,990 |  |  |  | 98 |
Restricted cash included in long-term assets |  |  | — |  |  |  | 270 |
Total cash, cash equivalents, and restricted cash and cash equivalents shown in the Condensed Consolidated Statements of Cash Flows |  | $ | 33,298 |  |  | $ | 36,562 |

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