Note 6 - Property and Equipment (Details Textual) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Depreciation, Depletion and Amortization, Total	$ 678	$ 726
Occupancy and Equipment Expense [Member]
Operating Leases, Rent Expense, Net, Total	$ 287	$ 304
Home Town Residential Mortgage LLC [Member] \| Roanoke [Member]
Lessee, Operating Lease, Term of Contract	1 year
Main Office [Member]
Lessee, Operating Lease, Term of Contract	10 years
Lessee Leasing Arrangements, Operating Leases, Number of Additional Renewal Terms	1
Lessee, Operating Lease, Renewal Term	10 years
Maximum Rental Increase	3.00%
Branch Location [Member]
Lessee, Operating Lease, Term of Contract	10 years
Lessee Leasing Arrangements, Operating Leases, Number of Additional Renewal Terms	2
Lessee, Operating Lease, Renewal Term	5 years
Automated Teller Machine [Member]
Lessee, Operating Lease, Term of Contract	8 years
Lessee Leasing Arrangements, Operating Leases, Number of Additional Renewal Terms	2
Maximum Rental Increase	3.00%
Automated Teller Machine [Member] \| Expires on April 1, 2026 [Member]
Lessee, Operating Lease, Renewal Term	5 years

Represents number of additional renewal terms under operating lease agreement.

No definition available.

Name:	hmta_LesseeLeasingArrangementsOperatingLeasesNumberOfAdditionalRenewalTerms
Namespace Prefix:	hmta_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum rental increase.

+ References

No definition available.

+ Details

Name:	hmta_MaximumRentalIncrease
Namespace Prefix:	hmta_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

+ Details

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

- Definition

Term of lessee's operating lease renewal, 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)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

+ Details

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- 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

+ Details

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

- Details

Name:	us-gaap_IncomeStatementLocationAxis=hmta_OccupancyAndEquipmentExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=hmta_HomeTownResidentialMortgageLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=hmta_RoanokeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=hmta_MainOfficeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=hmta_BranchLocationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=hmta_AutomatedTellerMachineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=hmta_ExpiresOnApril12026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: