Note 8 - Investments in Marketable Securities (Details Textual) - USD ($) |
1 Months Ended | 3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|---|
Mar. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Mar. 31, 2025 |
Mar. 31, 2024 |
Sep. 30, 2024 |
|
| Marketable Securities, Accumulated Unrealized Gain (Loss) | $ 292,396,000 | $ 219,597,000 | ||||
| Marketable Security, Unrealized Gain (Loss) | $ 72,799,000 | $ 20,193,000 | $ 72,799,000 | $ 34,454,000 | ||
| Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale | $ 40,579,000 | $ 40,579,000 | ||||
| Marketable Security, Realized Gain (Loss) | $ 14,261,000 | |||||