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Other Income (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Other Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from insurance settlement |  |  |  |  |  |  |  |  | $ 534,000 | $ 589,000 | $ 233,000
Gain on insurance settlement | $ 616,000 | $ 34,000 | $ 2,000 | $ 52,000 | $ 279,000 | $ 31,000 | $ 272,000 |  | 652,000 | 634,000 | $ 233,000
Des Moines, Iowa market |  |  |  |  |  |  |  |  |  |  |
Other Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from insurance settlement | 445,000 |  |  |  | 290,000 |  | 250,000 |  |  |  |
Gain on insurance settlement | $ 445,000 |  |  |  | $ 290,000 |  | $ 250,000 |  |  | $ 540,000 |
Bellingham, Washington |  |  |  |  |  |  |  |  |  |  |
Other Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of land and buildings |  |  |  |  |  |  |  | $ 1,700,000 |  |  |
Gain on sale of land and buildings |  |  |  |  |  |  |  | 1,400,000 |  |  |
Keene, New Hampshire market |  |  |  |  |  |  |  |  |  |  |
Other Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from insurance settlement |  |  |  |  |  |  |  | 208,000 |  |  |
Gain on insurance settlement |  |  |  |  |  |  |  | $ 208,000 |  |  |
Other Nonoperating Income (Expense) [Member] |  |  |  |  |  |  |  |  |  |  |
Other Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reimbursements received |  |  |  |  |  |  |  |  | $ 116,000 |  |

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