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Note 1 - Summary of Operations and Significant Accounting Policies (Detail) - Computation of basic and diluted earnings per share (Parentheticals) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Net Income (Loss) from continuing operations, participating securities (unvested restricted stock awards) | 0 | 3,000

X
- Definition Participating Securities + References No definition available. + Details
Name: | ulbi_ParticipatingSecurities
Namespace Prefix: | ulbi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration