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Note 7 - Revolving Credit Agreement - Interest Rate Margins (Details) - KeyBank [Member] - Revolving Credit Facility [Member] - Scenario, Forecast [Member]	10 Months Ended	26 Months Ended
	Apr. 01, 2018	May 30, 2020
Applicable basis points for unused fee	0.20%
London Interbank Offered Rate (LIBOR) [Member]
Interest rate margin on outstanding borrowings	1.85%
Base Rate [Member]
Interest rate margin on outstanding borrowings	(0.50%)
Leverage Ratio Less Than 1.5 [Member]
Applicable basis points for unused fee		0.20%
Leverage Ratio Less Than 1.5 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Interest rate margin on outstanding borrowings		1.85%
Leverage Ratio Less Than 1.5 [Member] | Base Rate [Member]
Interest rate margin on outstanding borrowings		(0.50%)
Leverage Ratio Between 1.5 and 2.5 [Member]
Applicable basis points for unused fee		0.15%
Leverage Ratio Between 1.5 and 2.5 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Interest rate margin on outstanding borrowings		2.00%
Leverage Ratio Between 1.5 and 2.5 [Member] | Base Rate [Member]
Interest rate margin on outstanding borrowings		(0.25%)
Leverage Ratio Greater than 2.5 [Member]
Applicable basis points for unused fee		0.10%
Leverage Ratio Greater than 2.5 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Interest rate margin on outstanding borrowings		2.15%
Leverage Ratio Greater than 2.5 [Member] | Base Rate [Member]
Interest rate margin on outstanding borrowings		0.00%

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ulbi_KeybankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=ulbi_LeverageRatioLessThan15Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=ulbi_LeverageRatioBetween15And25Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=ulbi_LeverageRatioGreaterThan25Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: