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OPERATING LEASES (Details Textual) - USD ($)		12 Months Ended
	Aug. 13, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2013
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense		$ 298,000	$ 308,000	$ 307,000
Operating Leases Cumulative Loss					$ 115,000
Operating Leases, Rent Expense, Net		$ 0	$ 0	$ 76,000
Lease Expiration Period	7 years

X

- Definition

Period on which lease or group of leases is set to expire.

+ References

No definition available.

+ Details

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Namespace Prefix:	ams_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cumulative loss due to subleased.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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