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Note 6 - Goodwill, Other Intangibles, and Other Assets (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 03, 2018
Additional Amortization Resulting from Termination of Non-compete Agreement |  | $ 1.3 |  |  |
Termination of Non-ompete Agreement, Effect on Earnings, after Tax |  | $ (1.0) |  |  |
Termination of Non-comepete Agreement, Effect on Earnings Per Share, after Tax (in dollars per share) |  | $ (0.06) |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  | 105 months | 128 months |  |
Amortization of Intangible Assets, Total |  | $ 5.1 | $ 2.9 | $ 1.5 |
Trade Names [Member] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  | 9 months | 162 months |  |
Landair Holdings Inc [Member] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  | 100.00%
Landair Holdings Inc [Member] | Trade Names [Member] |  |  |  |  |
Finite-Lived Intangible Assets, Remaining Amortization Period (Month) | 15 months |  |  |  |
Acquired Finite-lived Intangible Asset, Residual Value | $ 0.5 |  |  |  |

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- Definition The aggregate expected value at the end of their useful life of a major finite-lived intangible asset class acquired during the period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 + Details
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