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Dividends Declared Per Share (Tables) | 3 Months Ended
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Mar. 31, 2023
DIVIDENDS DECLARED PER SHARE [Abstract] |
Schedule of Dividends Declared |
Declaration Date |  | Date Paid (Payable) |  | Shareholder of Record Date |  | Dividend Amount |
04/26/23 |  | 05/30/23 |  | 05/15/23 |  | $ | 0.405 |
01/25/23 |  | 02/28/23 |  | 02/14/23 |  | $ | 0.405 |
10/26/22 |  | 11/28/22 |  | 11/14/22 |  | $ | 0.390 |
07/27/22 |  | 08/26/22 |  | 08/12/22 |  | $ | 0.390 |
04/27/22 |  | 05/27/22 |  | 05/13/22 |  | $ | 0.390 |
01/26/22 |  | 02/25/22 |  | 02/11/22 |  | $ | 0.390 |

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- Definition Tabular disclosure of information related to dividends declared, including paid and unpaid dividends. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | utl_DividendsDeclaredPerShareAbstract
Namespace Prefix: | utl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration