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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: