Foreclosed Assets (Foreclosed Asset Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Foreclosed Assets [Abstract]
Operating expenses, net of income	$ 11	$ 8	$ 11
Net expense (income)	$ 11	$ 8	$ 11

The amount of operating expenses net of rental income from foreclosed assets.

No definition available.

Name:	mnpt_OperatingExpensesNetOfRentalIncome
Namespace Prefix:	mnpt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration