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Note 5 - Subsequent Acquisition of Royalty Properties (Details Textual) - Subsequent Event [Member] - JSFM, LLC [Member] - Property Located in Dunn, McKenzie, McLean and Mountrail Counties, North Dakota [Member]	Apr. 30, 2021 a shares
Area of Real Estate Property (Acre) | a	6,400
Partners' Capital Account, Units, Acquisitions (in shares) | shares	725,000

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Area of a real estate property.

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Change in the number of units for each class of partners' capital accounts during the year due to acquisitions. Partners include general, limited and preferred partners.

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