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Note 1 - Basis of Presentation and General Information (Tables)
12 Months Ended
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