Note 15 - Commitments and Contingencies (Details Textual) $ in Millions	Mar. 31, 2022 USD ($)
Letters of Credit Issued and Available Amount	$ 10.5

The letters of credit issued and available amount.

No definition available.

Name:	hmnf_LettersOfCreditIssuedAndAvailableAmount
Namespace Prefix:	hmnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant