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Note 2 - Acquisition of Royalty Properties (Details Textual) $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 30, 2021 USD ($) a shares	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) a	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Oil and Gas Property, Full Cost Method, Net, Total		$ 71,851		$ 71,851	$ 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		300		100
Oil and Gas Property, Full Cost Method, Net, Total		$ 11,500		$ 11,500
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

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