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Note 7 - Goodwill and Other Acquired Intangible Assets, Net - Impairment Analysis (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]              
Impairment of goodwill $ 4,828 $ 0 $ 0 $ 0 $ 0 $ 4,828 $ 0
Finite-Lived Intangible Assets, Net         13,241    
Goodwill [Line Items]              
Impairment of goodwill 4,828 $ 0 $ 0 $ 0 0 4,828 $ 0
Client relationships              
Finite-Lived Intangible Assets [Line Items]              
Impairment of Intangible Assets, Finite-lived         1,000    
Technology              
Finite-Lived Intangible Assets [Line Items]              
Impairment of Intangible Assets, Finite-lived         300    
Other Intangible Assets              
Finite-Lived Intangible Assets [Line Items]              
Impairment of Intangible Assets, Finite-lived         0    
Real Estate Segment              
Finite-Lived Intangible Assets [Line Items]              
Impairment of goodwill         0 4,828  
Impairment of Intangible Assets, Finite-lived           13,700  
Finite-Lived Intangible Assets, Net 18,385       13,241 18,385  
Goodwill [Line Items]              
Impairment of goodwill         0 4,828  
Real Estate Segment | Client relationships              
Finite-Lived Intangible Assets [Line Items]              
Finite-Lived Intangible Assets, Net 16,281       11,991 16,281  
Real Estate Segment | Technology              
Finite-Lived Intangible Assets [Line Items]              
Finite-Lived Intangible Assets, Net $ 1,646       915 $ 1,646  
Held-for-sale | Real Estate Segment              
Finite-Lived Intangible Assets [Line Items]              
Finite-Lived Intangible Assets, Net         $ 3,700