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Note 4 - Cost and Estimated Earnings in Excess of Billings on Uncompleted Contracts and Billings in Excess of Costs and Estimated Earnings
 12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts and Billings in Excess of Costs and Estimated Earnings [Text Block]
4
.
COSTS AND ESTIMATED EARNINGS IN EXCESS OF BILLINGS ON UNCOMPLETED CONTRACTS AND BILLINGS IN EXCESS OF COSTS AND ESTIMATED EARNINGS:
 
C
osts and estimated earnings in excess of billings on uncompleted contracts represents revenue earned under the percentage-of-completion method but
not
yet billable based on the terms of the contracts. These amounts are billed based on the terms of the contracts, which include achievement of milestones, partial shipments or completion of the contracts. Billings in excess of costs and estimated earnings on uncompleted contracts represents amounts billed based on the terms of the contracts in advance of costs incurred and revenue earned.
 
   
December 31
,
  
   
201
7
    
201
6
  
   
(in thousands
)
  
Costs incurred on uncompleted contract
s
   $
227,048
     $
238,050
  
Estimated earning
s
    
9,722
      
7,247
  
     
236,770
      
245,297
  
Less billings to dat
e
    
(194,867
 )    
(203,672
 )
    $
41,903
     $
41,625
  
Amounts are presented in the Consolidated Balance Sheets as follows
:
                
Costs and estimated earnings in excess of billings on uncompleted contract
s
   $
44,502
     $
43,663
  
Billings in excess of costs and estimated earnings on uncompleted contract
s
    
(2,599
 )    
(2,038
 )
    $
41,903
     $
41,625