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Note 4 - Property and Equipment (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Gain (Loss) on Disposition of Oil and Gas and Timber Property, Total $ 220,800 $ 4,950 $ 253,907 $ 80,876
Depreciation, Total $ 234 $ 504 467 1,011
Depletion, Total     184 109
Land [Member]        
Gain (Loss) on Disposition of Oil and Gas and Timber Property, Total     $ 253,907 $ 80,876