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Note 2 - Costs 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, 2015
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,
 
 
 
2015
 
 
2014
 
 
 
(in thousands)
 
Costs incurred on uncompleted contracts
   $ 210,716     $ 265,552  
Estimated earnings
     31,921       53,744  
      242,637       319,296  
Less billings to date
     (200,565 )     (276,284 )
    $ 42,072     $ 43,012  
Amounts are presented in the Consolidated Balance Sheets as follows:
                
Costs and estimated earnings in excess of billings on uncompleted contracts
   $ 42,592     $ 45,847  
Billings in excess of costs and estimated earnings on uncompleted contracts
     (520 )     (2,835 )
    $ 42,072     $ 43,012