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Note 2 - Subsequent Events (Details Textual) - Subsequent Event [Member] - USD ($) $ in Thousands	Apr. 27, 2020	Apr. 14, 2020
Debt Instrument, Face Amount		$ 3,459
Proceeds from Issuance of Long-term Debt, Total	$ 3,459

X

- Definition

The cash inflow received from loan funding under the Paycheck Protection Program which was established under the Coronavirus Aid, Relief and Economic Security (CARES) Act in March 2020.

+ References

No definition available.

+ Details

Name:	ulbi_ProceedsFromPaycheckProtectionProgramUnderCARESAct
Namespace Prefix:	ulbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash outflow for funding under the Paycheck Protection Program which was established under the Coronavirus Aid, Relief and Economic Security (CARES) Act in March 2020.

+ References

No definition available.

+ Details

Name:	ulbi_RepaymentsOfPaycheckProtectionProgramUnderCARESAct
Namespace Prefix:	ulbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: