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Note 5 - Accounts Receivable, Net (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
  

March 31,

  

December 31,

 
  

2022

  

2021

 
  

(in thousands)

 

Trade receivables

 $30,811  $38,819 

Current unbilled receivables

  18,033   17,086 

Allowance for doubtful accounts

  (805)  (838)
  $48,039  $55,067