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Note 5 - Accounts Receivable, Net (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
  

September 30,

  

December 31,

 
  

2021

  

2020

 
  

(in thousands)

 

Trade receivables

 $33,461  $33,521 

Current portion of unbilled receivables

  21,643   16,496 

Allowance for doubtful accounts

  (878)  (1,767)
  $54,226  $48,250