Acquisitions - Purchases, Current (Details) $ / shares in Units, $ in Thousands				6 Months Ended
	Mar. 01, 2020 USD ($) item	Jan. 31, 2020 USD ($) item	Jan. 12, 2020 USD ($) item	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 item
BUSINESS COMBINATIONS AND ACQUISITIONS
Number of acquisitions | item					0
Acquisition price				$ 12,066
Capitalized closing costs and adjustments				636
Special assessments				168
Additional costs due to difference in unit price				$ 26
Aggregate number of limited partnership units issued for acquisition | shares				469,000
Price per limited partnership unit issued for acquisition, price one | $ / shares				$ 19.25
Aggregate value of limited partnership units issued for acquisition				$ 9,031
Assumed liabilities				265
Mortgage loan				3,225
Consideration in cash to pay for acquisitions				$ 375
Wolf Creek, Fargo, ND
BUSINESS COMBINATIONS AND ACQUISITIONS
Units acquired | item			54
Acquisition price			$ 4,968
Columbia Park Village, Grand Forks, ND
BUSINESS COMBINATIONS AND ACQUISITIONS
Units acquired | item		12
Acquisition price		$ 612
Belmont East & West, Bismarck, ND
BUSINESS COMBINATIONS AND ACQUISITIONS
Units acquired | item	26
Acquisition price	$ 1,494
Eastbrook, Bismarck, ND
BUSINESS COMBINATIONS AND ACQUISITIONS
Units acquired | item	24
Acquisition price	$ 1,296
Hawn, Fargo, ND
BUSINESS COMBINATIONS AND ACQUISITIONS
Units acquired | item	48
Acquisition price	$ 2,400
Rosser, Bismarck, ND
BUSINESS COMBINATIONS AND ACQUISITIONS
Units acquired | item	24
Acquisition price	$ 1,296