Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

No definition available.

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

- Definition

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_LossContingenciesLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

+ Details

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

- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

+ Details

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

- Details

Name:	us-gaap_LitigationCaseAxis=ztho_BreachOfContractAndTortuousInterferenceWithBusinessRelationshipMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationCaseAxis=ztho_MechanicsLienOnPropertyLeasedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LitigationCaseAxis=ztho_ViolationOfConsumerFraudActMember
Namespace Prefix:
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Period Type:

PENDING LITIGATION/ CONTINGENT LIABILITY (Details) (USD $)	3 Months Ended	0 Months Ended		12 Months Ended	0 Months Ended		3 Months Ended
	Mar. 31, 2015	Jul. 07, 2007	Dec. 12, 2011	Dec. 31, 2011	Jan. 21, 2014	Mar. 06, 2012	Mar. 31, 2012
Loss Contingencies [Line Items]
Cash settlement	$ 10,000us-gaap_LitigationSettlementAmount
Violation of the Consumer Fraud Act [Member]
Loss Contingencies [Line Items]
Reserve allocated for litigation settlement		102,000
Violation of the Consumer Fraud Act [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Damages sought in case		200,000
Breach of Contract and Tortuous Interference with Business Relationship [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Damages sought in case			185,000	185,000
Mechanics lien on Property Leased [Member]
Loss Contingencies [Line Items]
Settlement of lien						62,500	62,500
Cash settlement					10,000
Mechanics lien on Property Leased [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Damages sought in case			$ 95,000	$ 95,000