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Note 6 - Debt (Tables) | 6 Months Ended
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Jun. 30, 2013
Debt Disclosure [Abstract] |
Credit Facility, Variable Interest Rate [Table Text Block] |
Quarterly Average Undrawn Borrowing Availability | Applicable Margin for Alternate Base Rate Loans | Applicable Margin for LIBOR Rate Loans
Greater than $8,000,000 | 1.00% | 2.00%
$5,000,000 up to $8,000,000 | 1.25% | 2.25%
Less than $5,000,000 | 1.50% | 2.50%

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- Definition Credit Facility, Variable Interest Rate Table + References No definition available. + Details
Name: | ulbi_CreditFacilityVariableInterestRateTableTextBlock
Namespace Prefix: | ulbi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration