Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Mar. 31, 2022 |
Mar. 31, 2021 |
Mar. 31, 2022 |
Mar. 31, 2021 |
Sep. 30, 2021 |
|
| Cash Equivalents, at Carrying Value, Total | $ 0 | $ 0 | $ 0 | ||
| Asset Impairment Charges, Total | $ 0 | $ 0 | $ 0 | $ 0 | |
| X | ||||||||||
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| 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://www.xbrl.org/2009/role/commonPracticeRef
|