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Note 5 - Debt (Tables) | 12 Months Ended
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Dec. 31, 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