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Other Income (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Other Income [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Insurance Settlement, Investing Activities |  |  |  |  |  |  | $ 589,000 | $ 233,000 |
Other Nonoperating Income (Expense) | $ 52,000 | $ 279,000 | $ 31,000 | $ 272,000 | $ 20,000 | $ 213,000 | 634,000 | $ 233,000 | $ 16,000
Tower in Keene New Hampshire [Member] |  |  |  |  |  |  |  |  |
Other Income [Line Items] |  |  |  |  |  |  |  |  |
Gain (Loss) On Insurance Settlement |  |  |  |  |  | 208,000 |  |  |
Proceeds from Insurance Settlement, Investing Activities |  |  |  |  |  | 208,000 |  |  |
Tower in Des Moines Iowa [Member] |  |  |  |  |  |  |  |  |
Other Income [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Insurance Settlement, Investing Activities |  | 290,000 |  | 250,000 |  |  |  |  |
Other Nonoperating Income (Expense) |  | $ 290,000 |  | $ 250,000 |  |  | $ 540,000 |  |
Tower Sites In Bellingham Washington [Member] |  |  |  |  |  |  |  |  |
Other Income [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  |  | 1,700,000 |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  |  |  |  | $ 1,400,000 |  |  |

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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