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Note 1 - Basis of Presentation and General Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] |
As of December 31, |  | 2018 |  |  | 2019 |  |  | 2020 |
Consideration in cash |  |  | 23,450 |  |  |  | 14,350 |  |  |  | 62,000 |
Less: Carrying value of net assets of companies acquired |  |  | 1,190 |  |  |  | 7,649 |  |  |  | - |
Excess of consideration over acquired assets |  |  | 22,260 |  |  |  | 6,701 |  |  |  | 62,000 |

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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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