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Note 17 - Subsequent Events (Details Textual) | Oct. 30, 2024 $ / shares
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Subsequent Event [Member] | O 2024 Q1 Dividends [Member] |
Dividends Payable, Amount Per Share (in dollars per share) | $ 0.1375

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 + Details
Name: | us-gaap_DividendsPayableAmountPerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DividendsAxis=hnna_O2024Q1DividendsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |