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Note 9 - Discontinued Operations - Discontinued Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Operating revenues | $ 2,646 | $ 3,125
Operating costs and expenses | (2,787) | (2,585)
Depreciation expense |  | (283)
Impairment loss | (196) | (3,614)
Loss from discontinued operations | $ (337) | $ (3,357)

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- Definition Amount of depreciation and amortization expense attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
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