Note 1 - Organization and Operations (Details Textual) $ in Thousands |
3 Months Ended | 12 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2020
USD ($)
|
Sep. 30, 2020
USD ($)
|
Jun. 30, 2020
USD ($)
|
Mar. 31, 2020
USD ($)
|
Dec. 31, 2019
USD ($)
|
Sep. 30, 2019
USD ($)
|
Jun. 30, 2019
USD ($)
|
Mar. 31, 2019
USD ($)
|
Dec. 31, 2020
USD ($)
|
Dec. 31, 2019
USD ($)
|
|
| Number of Subsidiaries | 2 | 2 | ||||||||
| Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 0 | $ 90 | $ 0 | $ 18 | $ 593 | $ 2,361 | $ 1,483 | $ 437 | $ 108 | $ 4,874 |
| Net Income (Loss) Attributable to Parent, Total | (15,515) | $ (1,837) | $ (3,983) | $ (4,427) | (11,270) | $ (11,316) | $ (10,501) | $ (11,708) | (25,762) | (44,795) |
| Cash and Cash Equivalents, at Carrying Value, Ending Balance | $ 6,533 | $ 7,575 | $ 6,533 | $ 7,575 | ||||||
| X | ||||||||||
- Definition Represents the number of subsidiaries of the Company. No definition available.
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| 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. Also includes 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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| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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