Note 4 - Investments (Details Textual) $ in Thousands |
3 Months Ended | 12 Months Ended |
|---|---|---|
|
Mar. 31, 2026
USD ($)
|
Sep. 30, 2025
USD ($)
|
|
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 6 | 6 |
| Debt Securities, Available for Sale, Other than Temporary Impairment | $ 0 | $ 0 |
| Debt Securities, Available-for-Sale, Allowance for Credit Loss | $ 0 | $ 0 |
| X | ||||||||||
- Definition Represents other than temporary impairment of debt securities available for sale. No definition available.
|
| X | ||||||||||
- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
|