XML 64 R7.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Consolidated Statements of Changes in Common Stock Equity (Parenthetical) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Dividends per Common Share | $ 1.38 us-gaap_CommonStockDividendsPerShareCashPaid | $ 1.38 us-gaap_CommonStockDividendsPerShareCashPaid | $ 1.38 us-gaap_CommonStockDividendsPerShareCashPaid
Common Stock, Shares issued | 38,020 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 39,559 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 41,752 us-gaap_StockIssuedDuringPeriodSharesNewIssues
Common Stock, Shares issued |  |  | 2,760,000 utl_CommonStockIssuedDuringPeriodPublicOfferingShares

X
- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_CommonStockDividendsPerShareCashPaid
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Common Stock Issued During Period, Public Offering, Shares + References No definition available. + Details
Name: | utl_CommonStockIssuedDuringPeriodPublicOfferingShares
Namespace Prefix: | utl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration