Note 7 - Derivative - Interest Rate Swap Agreement - Information on Interest Rate Swaps (Details)	6 Months Ended
Sep. 30, 2018 USD ($)
Notional amounts	$ 11,550,000
FHLB Advance Swap 1 [Member]
Notional amounts	$ 1,850,000
Effective Start Date	Mar. 09, 2017
Maturity Date	Mar. 09, 2022
Pay Fixed Rate	2.24%
Receive Floating Rate	3-Month LIBOR
FHLB Advance Swap 2 [Member]
Notional amounts	$ 1,850,000
Effective Start Date	Mar. 09, 2017
Maturity Date	Mar. 09, 2024
Pay Fixed Rate	2.41%
Receive Floating Rate	3-Month LIBOR
FHLB Advance Swap 3 [Member]
Notional amounts	$ 1,850,000
Effective Start Date	Mar. 09, 2017
Maturity Date	Mar. 09, 2027
Pay Fixed Rate	2.57%
Receive Floating Rate	3-Month LIBOR
FHLB Advance Swap 4 [Member]
Notional amounts	$ 2,000,000
Effective Start Date	Mar. 29, 2017
Maturity Date	Mar. 29, 2022
Pay Fixed Rate	2.08%
Receive Floating Rate	3-Month LIBOR
FHLB Advance Swap 5 [Member]
Notional amounts	$ 2,000,000
Effective Start Date	Mar. 29, 2017
Maturity Date	Mar. 29, 2024
Pay Fixed Rate	2.24%
Receive Floating Rate	3-Month LIBOR
FHLB Advance Swap 6 [Member]
Notional amounts	$ 2,000,000
Effective Start Date	Mar. 29, 2017
Maturity Date	Mar. 29, 2027
Pay Fixed Rate	2.40%
Receive Floating Rate	3-Month LIBOR

Represents the receive floating rate of derivative contract.

No definition available.

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Namespace Prefix:	hbk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeMaturityDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=hbk_FHLBAdvanceSwap2Member
Namespace Prefix:
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- Details

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Namespace Prefix:
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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=hbk_FHLBAdvanceSwap4Member
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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=hbk_FHLBAdvanceSwap5Member
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- Details

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