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Note 11 - Commitments and Contingencies (Details Textual) | Dec. 14, 2020 USD ($) | Dec. 04, 2020 USD ($) | Dec. 31, 2020 USD ($) | Jan. 24, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) item
--- | --- | --- | --- | --- | --- | ---
Deposits Assets, Noncurrent |  |  | $ 554,000 |  | $ 134,000 |
The 1904 Pipeline [Member] |  |  |  |  |  |
Miles of Pipeline |  |  | 96 |  |  |
US Bureau of Land Management (“BLM”) [Member] |  |  |  |  |  |
Right of Way Agreement, Period (Year) | 30 years |  |  |  |  |
Right of Way Agreement, Annual Rent Expense | $ 321,000 |  |  |  |  |
US Bureau of Land Management (“BLM”) [Member] | Other Noncurrent Assets [Member] |  |  |  |  |  |
Deposits Assets, Noncurrent | $ 420,000 |  | $ 420,000 |  |  |
124-mile Extension Possible for Northern Pipeline, Available for Purchase [Member] | El Paso Natural Gas Company (“EPNG”) [Member] |  |  |  |  |  |
Miles of Pipeline | item |  |  |  |  |  | 124
Other Commitment, Total |  |  |  | $ 21,000,000 |  | $ 20,000,000
Payments to Acquire Productive Assets, Total |  | $ 1,000,000 |  |  |  |
124-mile Extension Possible for Northern Pipeline, Available for Purchase [Member] | El Paso Natural Gas Company (“EPNG”) [Member] | Other Noncurrent Assets [Member] |  |  |  |  |  |
Deposit Assets, Total |  |  |  |  |  | $ 2,000,000
Water Project [Member] |  |  |  |  |  |
Deferred Revenue, Total |  |  | $ 750,000 |  | $ 750,000 |

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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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