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Note 3 - Contracts With Customers (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
2018
  
Subscription services recognized ratably over time
   $
104,777
  
Services recognized at a point in time
    
4,775
  
Fixed, non-subscription recognized over time
    
3,163
  
Unit price services recognized over time
    
6,971
  
Total revenue
   $
119,686
  
Contract with Customer, Asset and Liability [Table Text Block]
   

December 31, 2018
    
Balance at 1/1/2018
as adjusted (1)
  
Accounts receivables
   $
11,922
     $
14,674
  
Contract assets included in other current assets
   $
53
     $
74
  
Deferred Revenue
   $
(16,244
)
   $
(16,642
)
   
2018
  
   
Contract Assets
    
Deferred Revenue
  
   
Increase (Decrease)
  
Revenue recognized that was included in deferred revenue at beginning of year due to completion of services
   $
-
     $
(16,372
)
Increases due to invoicing of client, net of amounts recognized as revenue
    
-
      
16,119
  
Decreases due to completion of services (or portion of services) and transferred to accounts receivable
    
(74
)
    
-
  
Change due to cumulative catch-up adjustments arising from changes in expected contract consideration
    
 
      
(145
)
Decreases due to impairment
    
-
      
-
  
Increases due to revenue recognized in the period with additional performance obligations before invoicing
    
53
      
-