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v3.23.3

Note 14 - Concentration of Credit Risk (Details Textual) $ in Millions | Sep. 30, 2023 USD ($)
--- | ---
Deposit In Excess of Insured Amount | $ 1.1
Money Market Funds [Member] |
Cash, Uninsured Amount | $ 59.3

X
- Definition The amount of 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_CashAndCashEquivalentsAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |