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Note 4 - Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
  

2021

  

2020

 

Billed receivables

 $395.5  $380.5 

Unbilled receivables

  72.1   69.6 

Total receivables

  467.6   450.1 

Less allowance for doubtful accounts

  (21.3)  (17.7)

Accounts receivable, net

 $446.3  $432.4