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Note 2 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Property and equipment, gross	$ 74,505,000	$ 72,854,000
Accumulated depreciation	(42,220,000)	(41,729,000)
Net property and equipment	32,285,000	31,125,000
Non-US [Member]
Net property and equipment	8,161,000	6,104,000
Medical Equipment and Facilities [Member]
Property and equipment, gross	73,789,000	71,148,000
Office Equipment [Member]
Property and equipment, gross	598,000	594,000
Construction in Progress [Member]
Property and equipment, gross	$ 118,000	$ 1,112,000

X

- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale, excluding land.

+ References

No definition available.

+ Details

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Namespace Prefix:	ams_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale, excluding land.

+ References

No definition available.

+ Details

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Namespace Prefix:	ams_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(14))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

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- Details

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- Details

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X

- Details

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