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Note 9 - Receivables, Net
9 Months Ended
Sep. 30, 2020
Notes to Financial Statements  
Financing Receivables [Text Block]

9.  Receivables, net 

Receivables include billed and unbilled amounts for services provided to clients for which we have an unconditional right to payment as of the end of the applicable period and do not bear interest. The following table presents major categories of receivables (in thousands):

               

As Restated

 
      September 30, 2020       December 31, 2019     September 30, 2019  

Contracts completed and in progress:

                       

Billed

  $ 355,293     $ 299,633     $ 417,373  

Unbilled

    167,311       149,696       182,762  

Total contracts completed and in progress

    522,604       449,329       600,135  

Material sales

    70,918       42,936       72,486  

Other

    71,691       55,526       41,259  

Total gross receivables

    665,213       547,791       713,880  

Less: allowance for credit losses

    3,265       374       908  

Total net receivables

  $ 661,948     $ 547,417     $ 712,972  

Included in other receivables at  September 30, 2020, December 31, 2019 and September 30, 2019, were items such as estimated recovery from back charge claims, notes receivable, fuel tax refunds and income tax refunds. No such receivables individually exceeded 10% of total net receivables at any of these dates.