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Note 2 - Management Contracts Purchased (Details Textual) $ in Thousands	3 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Number of Purchases of Assets	12
Number of Investment Funds	33
Management Contracts Purchased, Impairment	$ 0
Previously Capitalized Management Contract Costs	$ 310	$ 0

X

- Definition

Amount of impairment of management contracts purchased.

+ References

No definition available.

+ Details

Name:	hnna_ManagementContractsPurchasedImpairment
Namespace Prefix:	hnna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the number of investment funds.

+ References

No definition available.

+ Details

Name:	hnna_NumberOfInvestmentFunds
Namespace Prefix:	hnna_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents number of purchases of assets.

+ References

No definition available.

+ Details

Name:	hnna_NumberOfPurchasesOfAssets
Namespace Prefix:	hnna_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of expense realted to previously capitalized management contract costs.

+ References

No definition available.

+ Details

Name:	hnna_PreviouslyCapitalizedManagementContractCosts
Namespace Prefix:	hnna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration