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Note 3 - 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, 2016
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,
 
 
 
2016
 
 
2015
 
 
 
(in thousands)
 
Costs incurred on uncompleted contracts
   $
238,050
    $
210,716
 
Estimated earnings
    
7,247
     
31,921
 
     
245,297
     
242,637
 
Less billings to date
    
(203,672
 )    
(200,565
 )
    $
41,625
    $
42,072
 
Amounts are presented in the Consolidated Balance Sheets as follows:
                
Costs and estimated earnings in excess of billings on uncompleted contracts
   $
43,663
    $
42,592
 
Billings in excess of costs and estimated earnings on uncompleted contracts
    
(2,038
 )    
(520
 )
    $
41,625
    $
42,072