Note 20 - Supplemental Oil and Gas Disclosures - Schedule of Prices Weighted by Field Production Related to Proved Reserves (Details)

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Note 20 - Supplemental Oil and Gas Disclosures - Schedule of Prices Weighted by Field Production Related to Proved Reserves (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Oil [Member]
Weighted price	$ 58.11	$ 65.21	$ 46.58	$ 36.28
Natural Gas Liquids [Member]
Weighted price	18.72	29.73	22.65	16.82
Natural Gas [Member]
Weighted price	$ 2.63	$ 3.13	$ 2.86	$ 2.47