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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 (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts and Billings in Excess of Costs and Estimated Earnings [Table Text Block]
   
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