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Note 4 - Other Assets (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 14, 2020
Deposits Assets, Noncurrent | $ 554,000 | $ 134,000 |
US Bureau of Land Management (“BLM”) [Member] | Other Noncurrent Assets [Member] |  |  |
Deposits Assets, Noncurrent | 420,000 |  | $ 420,000
Prepaid Rent [Member] |  |  |
Amortization of Deferred Charges, Total | $ 115,000 | $ 115,000 |

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