Note 3 - Cash and Cash Equivalents (Details Textual) - USD ($) $ in Thousands |
Sep. 30, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Cash, Ending Balance | $ 180 | $ 329 |
| Cash Equivalents, at Carrying Value, Total | $ 74,915 | $ 117,064 |
| X | ||||||||||
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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