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Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual) $ in Thousands | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | ---
Number of Wholly Owned Subsidiaries | 7 |  |
Cash and Cash Equivalents, at Carrying Value, Ending Balance | $ 19,584 | $ 23,319 | $ 17,092
Restricted Cash, Current | 295 | 282 |
Restricted Cash, Noncurrent | 1,180 | $ 395 |
Immaterial Correction of Prior Period Financial Statements [Member] |  |  |
Prepaid Expenses and Accrued Liabilities | $ 5,205 |  |

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