Note 4 - Distributions to Holders of Common Units (Details Textual) - $ / shares	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Number of Units That Cash Distributions Were Paid on During the Period (in shares)	34,679,774	34,679,774
Distribution Made to Limited Partner, Distributions Paid, Per Unit (in dollars per share)	$ 0.226318