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Note 2 - Acquisition of Royalty Properties (Details Textual) $ in Thousands		3 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($) a shares	Jun. 30, 2021 USD ($) a	Jun. 30, 2021 USD ($) a	Dec. 31, 2020 USD ($)
Oil and Gas Property, Full Cost Method, Net, Total	$ 75,088	$ 75,088	$ 75,088	$ 67,963
Royalty Interests in Bakken Trend [Member] | Partnership Interest [Member]
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares	725,000
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable	$ 12,200
Asset Acquisition, Consideration Transferred, Royalty Revenue Received		400
Asset Acquisition, Consideration Transferred, Transaction Cost			100
Oil and Gas Property, Full Cost Method, Net, Total	$ 11,900	$ 11,900	$ 11,900
JSFM, LLC [Member] | Property Located in Dunn, McKenzie, McLean and Mountrail Counties, North Dakota [Member]
Area of Real Estate Property (Acre) | a	6,400	6,400	6,400

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
-Section 30
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