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Note 2 - Basis of Presentation and Summary of Significant Accounting Policies - Other Property and Equipment, Net (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Other property and equipment, net | $ 2,473,000 | $ 1,600,000
Land [Member] |  |
Other property and equipment, net | 1,122,000 | 1,122,000
Transportation Equipment [Member] |  |
Other property and equipment, net | 609,000 | 202,000
Building [Member] |  |
Other property and equipment, net | 532,000 | 0
Leasehold Improvements [Member] |  |
Other property and equipment, net | 161,000 | 143,000
Technology Equipment [Member] |  |
Other property and equipment, net | 42,000 | 125,000
Field Equipment [Member] |  |
Other property and equipment, net | $ 7,000 | $ 8,000

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 360 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124429447&loc=SL124453093-239630 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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