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Note 6 - Leases (Details Textual)		1 Months Ended	12 Months Ended
	Nov. 03, 2021 USD ($) ft²	Dec. 01, 2021 USD ($)	Dec. 31, 2022 USD ($) ft²	Dec. 31, 2021 USD ($)
Operating Lease, Right-of-Use Asset			$ 317,000	$ 654,000
Operating Lease, Liability, Total			351,000	351,000
Operating Lease, Expense			$ 290,000	377,000
Condominium Space for Gamma Knife Facility in Guayaquil, Ecuador [Member]
Area of Real Estate Property (Square Foot) | ft²			864
Land and Parking Spaces for Gamma Knife Facility in Guayaquil, Ecuador [Member]
Area of Real Estate Property (Square Foot) | ft²			10,135
Minimum [Member]
Lessee, Operating Lease, Discount Rate			4.00%
Lessee, Operating Lease, Remaining Lease Term (Year)			1 year
Maximum [Member]
Lessee, Operating Lease, Discount Rate			6.00%
Lessee, Operating Lease, Remaining Lease Term (Year)			2 years
Sublease Office in San Francisco, California [Member]
Area of Real Estate Property (Square Foot) | ft²	3,253		3,253
Operating Lease, Monthly Expense	$ 22,011		$ 22,011
Lessee, Operating Sublease, Monthly Income	$ 16,195		$ 16,195
Operating Lease, Impairment Loss		$ 77,000
Lease Agreement for New Corporate Office [Member]
Area of Real Estate Property (Square Foot) | ft²	900
Operating Lease, Monthly Expense	$ 4,500
Operating Lease, Right-of-Use Asset		$ 151,000
Corporate Office in San Francisco [Member]
Area of Real Estate Property (Square Foot) | ft²			900
Operating Lease, Monthly Expense			$ 4,500
Stand-alone Facility in Lima, Peru [Member]
Area of Real Estate Property (Square Foot) | ft²			1,600
Operating Lease, Monthly Expense			$ 8,850
Operating Lease, Impairment Loss				$ 77,000

X

- Definition

monthly amount of sublease income for operating lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	ams_
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Balance Type:	credit
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X

- Definition

Amount of operating lease expense per month. Excludes sublease income.

+ References

No definition available.

+ Details

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Namespace Prefix:	ams_
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X

- Definition

Area of a real estate property.

+ References

No definition available.

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X

- Definition

Discount rate used by lessee to determine present value of operating lease payments.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)(3)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

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- Definition

Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

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X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977

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X

- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 25
-Paragraph 6
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=123399704&loc=SL77918431-209957

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X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

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X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

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