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Concentration of Credit Risk - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013
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Concentration Risk [Line Items] |
Deposit amount exceeding the FDIC insurance limit | $ 0.97
First American Prime Obligations Fund [Member] |
Concentration Risk [Line Items] |
Uninsured amount of cash and cash equivalents | 5.7
UBS [Member] |
Concentration Risk [Line Items] |
Uninsured amount of cash and cash equivalents | $ 1.5

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