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Note 6 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 20, 2023
Feb. 01, 2023
Sep. 30, 2023
Sep. 30, 2023
Dec. 31, 2022
Feb. 01, 2022
Business Combination, Acquisition Related Costs     $ 100 $ 2,000    
Current Portion of Escrow     3,700 3,700 $ 0  
Business Combination, Contingent Consideration, Liability, Current     8,000 8,000 29,900  
Business Combination, Contingent Consideration, Liability, Noncurrent     $ 2,000 2,000 $ 0  
Krug Sachverständigen GmbH [Member]            
Business Combination, Consideration Transferred $ 43,300          
Business Combination, Consideration Transferred, Indemnity Escrows $ 3,800          
Mavera [Member]            
Business Combination, Consideration Transferred   $ 28,300        
Business Acquisition, Percentage of Voting Interests Acquired           100.00%
Business Combination, Indemnification Assets, Amount as of Acquisition Date   $ 4,200        
Goodwill, Acquired During Period       $ 56,400