FAIR VALUE MEASUREMENTS - Marketable Securities and Restricted Investments (Details) - Recurring Basis [Member] - Level 1 [Member] - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| FAIR VALUE MEASUREMENTS [Abstract] | ||||
| Total marketable securities and restricted investments, beginning balance | $ 513 | $ 2,760 | $ 4,914 | $ 1,824 |
| Acquisition of controlling financial interest of Rubicon | 0 | 0 | (4,631) | 0 |
| Unrealized gain (loss) | (35) | (80) | 93 | 793 |
| Purchase of securities (net of sales) | 199 | 79 | 301 | 142 |
| Total marketable securities and restricted investments, ending balance | $ 677 | $ 2,759 | $ 677 | $ 2,759 |
| X | ||||||||||
- Definition The net purchase (sale) of investments in marketable securities. No definition available.
|
| X | ||||||||||
- Definition Fair value portion of asset recognized for present right to economic benefit. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of realized gain (loss) on investment. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of unrealized gain (loss) on investment. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|