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Note 21 - Fair Value of Financial Instruments - Fair Values for Level 3 Measurements (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Nonrecurring [Member] $ in Thousands	Sep. 30, 2025 USD ($)
Roundhouse Electric & Equipment Co. Inc. [Member] | Trade Names [Member]
Indefinite-lived assets, fair value	$ 1,220
Roundhouse Electric & Equipment Co. Inc. [Member] | Relief from Royalty [Member] | Measurement Input, Royalty Rate [Member] | Trade Names [Member]
Indefinite-lived intangible assets, measurement input	0.015
Advanced Plumbing and Drain [Member] | Trade Names [Member]
Indefinite-lived assets, fair value	$ 1,600
Advanced Plumbing and Drain [Member] | Relief from Royalty [Member] | Measurement Input, Royalty Rate [Member] | Trade Names [Member]
Indefinite-lived intangible assets, measurement input	0.03
Southside Plumbing [Member] | Trade Names [Member]
Indefinite-lived assets, fair value	$ 1,100
Southside Plumbing [Member] | Relief from Royalty [Member] | Measurement Input, Royalty Rate [Member] | Trade Names [Member]
Indefinite-lived intangible assets, measurement input	0.03
Image Solutions, LLC [Member] | Trade Names [Member]
Indefinite-lived assets, fair value	$ 1,500
Image Solutions, LLC [Member] | Relief from Royalty [Member] | Measurement Input, Royalty Rate [Member] | Trade Names [Member]
Indefinite-lived intangible assets, measurement input	0.02
M.L.C. Plumbing, LLC [Member] | Trade Names [Member]
Indefinite-lived assets, fair value	$ 3,100
M.L.C. Plumbing, LLC [Member] | Relief from Royalty [Member] | Measurement Input, Discount Rate [Member] | Trade Names [Member]
Indefinite-lived intangible assets, measurement input	0.17
M.L.C. Plumbing, LLC [Member] | Relief from Royalty [Member] | Measurement Input, Royalty Rate [Member] | Trade Names [Member]
Indefinite-lived intangible assets, measurement input	0.05
Customer Relationships [Member] | Roundhouse Electric & Equipment Co. Inc. [Member]
Finite-lived assets, fair value	$ 11,000
Customer Relationships [Member] | Roundhouse Electric & Equipment Co. Inc. [Member] | Multi-period Excess Earnings [Member] | Measurement Input, Long-Term Revenue Growth Rate [Member]
Finite-lived intangible assets, measurement input	0.09
Customer Relationships [Member] | Roundhouse Electric & Equipment Co. Inc. [Member] | Multi-period Excess Earnings [Member] | Measurement Input, Attrition Rate [Member]
Finite-lived intangible assets, measurement input	0.21
Customer Relationships [Member] | Roundhouse Electric & Equipment Co. Inc. [Member] | Multi-period Excess Earnings [Member] | Measurement Input, Discount Rate [Member]
Finite-lived intangible assets, measurement input	0.20
Customer Relationships [Member] | Advanced Plumbing and Drain [Member]
Finite-lived assets, fair value	$ 1,100
Customer Relationships [Member] | Advanced Plumbing and Drain [Member] | Multi-period Excess Earnings [Member] | Measurement Input, Long-Term Revenue Growth Rate [Member]
Finite-lived intangible assets, measurement input	0.03
Customer Relationships [Member] | Advanced Plumbing and Drain [Member] | Multi-period Excess Earnings [Member] | Measurement Input, Attrition Rate [Member]
Finite-lived intangible assets, measurement input	0.17
Customer Relationships [Member] | Advanced Plumbing and Drain [Member] | Multi-period Excess Earnings [Member] | Measurement Input, Discount Rate [Member]
Finite-lived intangible assets, measurement input	0.16
Customer Relationships [Member] | Southside Plumbing [Member]
Finite-lived assets, fair value	$ 1,000
Customer Relationships [Member] | Southside Plumbing [Member] | Multi-period Excess Earnings [Member] | Measurement Input, Long-Term Revenue Growth Rate [Member]
Finite-lived intangible assets, measurement input	0.05
Customer Relationships [Member] | Southside Plumbing [Member] | Multi-period Excess Earnings [Member] | Measurement Input, Attrition Rate [Member]
Finite-lived intangible assets, measurement input	0.15
Customer Relationships [Member] | Southside Plumbing [Member] | Multi-period Excess Earnings [Member] | Measurement Input, Discount Rate [Member]
Finite-lived intangible assets, measurement input	0.14
Customer Relationships [Member] | Image Solutions, LLC [Member]
Finite-lived assets, fair value	$ 11,100
Customer Relationships [Member] | Image Solutions, LLC [Member] | Multi-period Excess Earnings [Member] | Measurement Input, Long-Term Revenue Growth Rate [Member]
Finite-lived intangible assets, measurement input	0.03
Customer Relationships [Member] | Image Solutions, LLC [Member] | Multi-period Excess Earnings [Member] | Measurement Input, Attrition Rate [Member]
Finite-lived intangible assets, measurement input	0.02
Customer Relationships [Member] | Image Solutions, LLC [Member] | Multi-period Excess Earnings [Member] | Measurement Input, Discount Rate [Member]
Finite-lived intangible assets, measurement input	0.25
Customer Relationships [Member] | M.L.C. Plumbing, LLC [Member]
Finite-lived assets, fair value	$ 500
Customer Relationships [Member] | M.L.C. Plumbing, LLC [Member] | Multi-period Excess Earnings [Member] | Measurement Input, Long-Term Revenue Growth Rate [Member]
Finite-lived intangible assets, measurement input	0.03
Customer Relationships [Member] | M.L.C. Plumbing, LLC [Member] | Multi-period Excess Earnings [Member] | Measurement Input, Attrition Rate [Member]
Finite-lived intangible assets, measurement input	0.30
Customer Relationships [Member] | M.L.C. Plumbing, LLC [Member] | Multi-period Excess Earnings [Member] | Measurement Input, Discount Rate [Member]
Finite-lived intangible assets, measurement input	0.18

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-13

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-13

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

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