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Subsequent events (Details) - $ / shares |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 18, 2023 | Oct. 19, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 19, 2023 | Jun. 30, 2022
Dividends [Abstract] |  |  |  |  |  |  |  |
Common stock, dividends declared (in dollars per share) |  |  | $ 0.14 | $ 0.13 | $ 0.28 | $ 0.26 |  |
Common stock, shares authorized (in shares) |  |  | 12,000,000 |  | 12,000,000 |  |  | 12,000,000
2023 Annual Dividend [Member] |  |  |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |
Common stock, dividends declared (in dollars per share) |  | $ 0.56 |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 12,000,000 |  |  |  |  |  | 36,000,000 |
Subsequent Event [Member] | 2023 Annual Dividend [Member] |  |  |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |
Common stock, dividends declared (in dollars per share) | $ 0.56 |  |  |  |  |  |  |
Subsequent Event [Member] | 2023 Q2 Dividend [Member] |  |  |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |  |  |
Dividends payable, date declared | Jan. 18, 2023 |  |  |  |  |  |  |
Common stock, dividends declared (in dollars per share) | $ 0.14 |  |  |  |  |  |  |
Dividends payable, date of record | Feb. 13, 2023 |  |  |  |  |  |  |
Dividends payable, date to be paid | Feb. 27, 2023 |  |  |  |  |  |  |

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