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Note 3 - Costs and Estimated Earnings and Billings on Uncompleted Contracts (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Excess Billings Over Earnings [Table Text Block]
    As of December 31,
    2016   2015
Costs incurred and estimated earnings on uncompleted  contracts   $
1,749,328
     $
1,741,070
  
Billings on uncompleted contracts    
(1,780,723
 )    
(1,744,721
 )
Excess of billings over costs incurred and estimated earnings   $
(31,395
 )   $
(3,651
 )
Schedule of Net Amount of Costs and Earnings on Uncompleted Contracts [Table Text Block]
    As of December 31,
    2016   2015
Costs and estimated earnings in excess of billings on uncompleted contracts   $
32,705
     $
26,905
  
Billings in excess of costs and estimated earnings on uncompleted contracts    
(64,100
 )    
(30,556
 )
Net amount of costs and estimated earnings on uncompleted contracts below billings   $
(31,395
 )   $
(3,651
 )