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Concentration of Credit Risk - Additional Information (Detail) $ in Millions | Sep. 30, 2016 USD ($)
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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

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- Definition Deposit in excess of insured amount. + References No definition available. + Details
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Namespace Prefix: | hnna_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- 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: |