Note 3 - New Accounting Standards (Details Textual) - Forecast [Member]	Mar. 31, 2023
Minimum [Member]
Increase (Decrease) for Loans and Leases Receivable Allowance, Percentage	7.00%
Maximum [Member]
Increase (Decrease) for Loans and Leases Receivable Allowance, Percentage	11.00%

Represents the increase (decrease) as a percentage of the amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

No definition available.

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Namespace Prefix:	hmnf_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant