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Leases (Tables)

9 Months Ended

Sep. 30, 2025

Leases

Schedule of lease costs

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The components of lease costs for the three- and nine-month periods ended September 30, 2025 and 2024 were as follows (in thousands):

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Three Months Ended September 30,

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Nine Months Ended September 30,

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Classification

2025

2024

2025

2024

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Operating lease costs(1)

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Cost of revenues

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$

998

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$

700

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$

2,697

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$

1,948

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Operating lease costs(1)

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Selling, general and administrative expenses

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78

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76

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240

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229

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Rental revenues

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Revenues

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(104)

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(47)

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(177)

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(269)

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Rental revenues

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Other (income) expense, net

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(7)

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(13)

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(61)

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(74)

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Net operating lease costs

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$

965

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$

716

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$

2,699

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$

1,834

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(1) Includes the costs of leases with a term of one year or less.

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Schedule of maturity of lease liability

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​	​	​	​
2025 (excluding the nine months ended September 30, 2025)	​	$	471
2026	​	​	1,673
2027	​	​	1,306
2028	​	​	612
2029	​	​	184
Thereafter	​	​	459
Total future minimum lease payments	​	​	4,705
Less imputed interest	​	​	(388)
Present value of lease liabilities	​	$	4,317

Schedule of supplemental cash flow information

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​	​	Nine Months Ended September 30,
​	​	2025		​	2024
Cash payments for lease liabilities included in operating cash flows	​	$	1,510	​	$	1,450
Right-of-use assets obtained in exchange for operating lease obligations	​	$	368	​	$	827

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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

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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

+ 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 the lessee operating lease supplemental cash flow information.

+ References

No definition available.

+ Details

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Namespace Prefix:	uslm_
Data Type:	dtr-types:textBlockItemType
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