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Note 8 - Operating Leases (Tables)

3 Months Ended

Mar. 31, 2025

Notes Tables

Lease, Cost [Table Text Block]

		Three-month period ended March 31,
		2025				2024
Operating lease cost		$	296			$	262
Variable lease cost			24				28
Total lease cost		$	320			$	290

Lessee, Lease, Cash Flow Information [Table Text Block]

		Three-month period ended March 31,
		2025				2024
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases		$	314			$	265
Right-of-use assets obtained in exchange for lease liabilities:		$	-			$	-

Lessee, Lease, Balance Sheet Information [Table Text Block]

	Balance sheet classification		March 31, 2025				December 31, 2024
Assets:
Operating lease right-of-use asset	Other noncurrent assets		$	3,905			$	4,153
Liabilities:
Current operating lease liability	Accrued expenses and other current liabilities		$	1,125			$	1,138
Operating lease liability, net of current portion	Other noncurrent liabilities			2,782				2,998
Total operating lease liability			$	3,907			$	4,136
Weighted-average remaining lease term (years)				4.3				4.5
Weighted-average discount rate				6.7	%			6.7	%

Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]

Maturity of operating lease liabilities
2025		$	873
2026			1,038
2027			984
2028			968
2029			508
Thereafter			107
Total lease payments			4,478
Less: Imputed interest			(571	)
Present value of remaining lease payments		$	3,907

X

- Definition

Tabular disclosure of balance sheet information related lessee's lease .

+ References

No definition available.

+ Details

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Namespace Prefix:	ulbi_
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Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of cash flow information related lessee's lease .

+ References

No definition available.

+ Details

Name:	ulbi_LesseeLeaseCashFlowInformationTableTextBlock
Namespace Prefix:	ulbi_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
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X

- Definition

Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-6

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- References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration