Note P - Subsequent Events (Details Textual) - MacKenzie Capital Management [Member] - Subsequent Event [Member]	Jul. 18, 2022 shares
Common Stock [Member]
Maximum Shares Required Under Offer (in shares)	103,500
Percentage of Outstanding Shares	1.33%
Preferred Stock [Member]
Maximum Shares Required Under Offer (in shares)	1,070
Percentage of Outstanding Shares	2.51%

Number of shares as a percentage of total outstanding shares.

No definition available.

Name:	minf_PercentageOfOutstandingShares
Namespace Prefix:	minf_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration