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Note 2 - Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Schedule of Cash and Cash Equivalents [Table Text Block] |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |
Cash and cash equivalents |  | $ | 35,161 |  |  | $ | 9,418 |
Restricted cash included in current assets |  |  | 891 |  |  |  | 2,025 |
Restricted cash included in long-term assets |  |  | 270 |  |  |  | 367 |
Total cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows |  | $ | 36,322 |  |  | $ | 11,810 |

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