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Note 4 - Cost and Estimated Earnings on Uncompleted Contracts (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Cost And Estimated Earnings On Uncompleted Contracts [Table Text Block]
   
December 31,
  
   
2018
   
2017
 
   
(Dollars in thousands)
  
Costs and estimated earnings incurred on uncompleted contracts
   $
278,797
     $
550,823
  
Less billings to date
    
(255,069
 )    
(530,119
 )
Total
   $
23,728
     $
20,704
  
   
December 31,
  
   
2018
   
2017
 
   
(Dollars in thousands)
  
Costs and estimated earnings in excess of billings on uncompleted contracts
   $
42,130
     $
40,945
  
Billings in excess of costs and estimated earnings on uncompleted contracts
    
(18,402
 )    
(20,241
 )
Total
   $
23,728
     $
20,704