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Concentration of Credit Risk - Additional Information (Detail) $ in Millions	Sep. 30, 2016 USD ($)
Concentration Risk [Line Items]
Deposit amount exceeding the FDIC insurance limit	$ 3.5
First American Retail Prime Obligation Money Market Fund [Member]
Concentration Risk [Line Items]
Uninsured amount of cash and cash equivalents	$ 0.2

X

- Definition

Deposit in excess of insured amount.

+ References

No definition available.

+ Details

Name:	hnna_DepositInExcessOfInsuredAmount
Namespace Prefix:	hnna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

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

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

Name:	us-gaap_ConcentrationRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CashAndCashEquivalentsAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: