Note 3 - Loans Receivable (Details Textual) $ in Thousands	3 Months Ended
Mar. 31, 2017 USD ($)	Mar. 31, 2016	Dec. 31, 2016 USD ($)
Financing Receivable, 90 Days Past Due and Still Accruing, Number of Loans	6		2
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	$ 215		$ 4
Financing Receivable, Modifications, Recorded Investment	$ 4,200		$ 6,400
Financing Receivable, Modifications, Number of Contracts	5	0
Financing Receivable, Modifications, Recorded Investment, Past Due	$ 18
Receivables, Change in Method of Calculating Impairment, Recorded Investment	18
Performing Financial Instruments [Member]
Financing Receivable, Modifications, Recorded Investment	$ 4,000
Financing Receivable, Modifications, Number of Contracts	2
Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications, Recorded Investment	$ 247
Financing Receivable, Modifications, Number of Contracts	3
Two of the Six Loans Past Due Ninety Days or More [Member]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	$ 207

Number of loans that are 90 days or more past due and still accruing.

No definition available.

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings that are past due at the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	hmta_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

+ Details

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

+ Details

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

- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

+ Details

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- Definition

Amount of receivables for which the allowance for credit losses had previously been measured under a general allowance for credit losses methodology, and are now identified as troubled debt restructurings.

+ References

No definition available.

+ Details

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- Details

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- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_NonperformingFinancingReceivableMember
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- Details

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