Note 6 - Treasury Stock and Net Income Per Common Share (Details Textual) - USD ($) $ in Millions |
1 Months Ended | 3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|---|
Jul. 24, 2024 |
Jun. 30, 2022 |
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2025 |
Mar. 31, 2024 |
Sep. 30, 2022 |
|
| Receipt of Donated Treasury Stock, Shares | 3,720 | ||||||
| Value of Donated Treasury Shares | $ 1 | ||||||
| Common Stock, Shares, Outstanding | 1,377,026 | ||||||
| Donated Shares, Granted | 400 | ||||||
| Weighted Average Number of Shares Outstanding, Basic | 1,377,426 | 1,377,026 | 1,377,268 | 1,377,026 | |||