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Note 9 - 401(k) Retirement Benefit Plan (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Defined Contribution Plan, Employer Matching Contribution, As A Percentage Of Employee's Contribution	50.00%
Defined Contribution Plan, Maximum Employee Contribution Percentage Subject To Employer Matching Contribution	4.00%
Defined Contribution Plan, Employer Matching Contribution, Percent	2.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount (in Dollars)	$ 243	$ 381

X

- Definition

Defined Contribution Plan, Employer Matching Contribution, As A Percentage Of Employee's Contribution

+ References

No definition available.

+ Details

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Namespace Prefix:	ulbi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined Contribution Plan, Maximum Employee Contribution Percentage Subject To Employer Matching Contribution

+ References

No definition available.

+ Details

Name:	ulbi_DefinedContributionPlanMaximumEmployeeContributionPercentageSubjectToEmployerMatchingContribution
Namespace Prefix:	ulbi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration