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Debt: Notes Payable (Details) - USD ($) | 1 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2022 | Jun. 25, 2022 | Sep. 30, 2021 | Aug. 31, 2017 | May 31, 2015
Note Agreement | Notes Payable. |  |  |  |  |
Notes Payable |  |  |  |  |
Principal amount outstanding |  | $ 45,600,000 |  |  |
Minimum prepayment |  | 1,000,000.0 |  |  |
Note Agreement | Series A Notes |  |  |  |  |
Notes Payable |  |  |  |  |
Principal amount outstanding |  | $ 9,000,000.0 |  |  |
Note payable, face amount |  |  |  |  | $ 25,000,000.0
Debt term |  | 10 years |  |  |
Interest rate (as a percent) |  | 5.50% |  |  |
Quarterly principal payment, first five years |  | $ 500,000 |  |  |
Quarterly principal payment, thereafter |  | 750,000 |  |  |
Note Agreement | Series B Notes |  |  |  |  |
Notes Payable |  |  |  |  |
Principal amount outstanding |  | $ 6,600,000 |  |  |
Note payable, face amount |  |  |  | $ 12,500,000 |
Debt term |  | 10 years |  |  |
Interest rate (as a percent) |  | 5.10% |  |  |
Quarterly principal payment |  | $ 312,500 |  |  |
Note Agreement | Series C Notes |  |  |  |  |
Notes Payable |  |  |  |  |
Principal amount outstanding |  | $ 30,000,000.0 |  |  |
Note payable, face amount |  |  | $ 30,000,000.0 |  |
Debt term |  | 7 years |  |  |
Interest rate (as a percent) |  | 3.18% |  |  |
Shelf Agreement | Senior Notes |  |  |  |  |
Notes Payable |  |  |  |  |
Principal amount outstanding |  | $ 0 |  |  |
Shelf Agreement term | 3 years |  |  |  |
Maximum amount of Shelf Notes available for issuance. | $ 100,000,000.0 |  |  |  |
Minimum prepayment | $ 1,000,000 |  |  |  |
Shelf Agreement | Senior Notes | Maximum |  |  |  |  |
Notes Payable |  |  |  |  |
Debt term | 12 years 6 months |  |  |  |

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