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Note 5 - Costs and Estimated Earnings and Billings on Uncompleted Contracts (Tables)
 12 Months Ended
Dec. 31, 2014
Contractors [Abstract]  
Schedule of Excess Billings Over Earnings [Table Text Block]
   
As of December 31,
 
   
2014
   
2013
 
Costs incurred and estimated earnings on uncompleted contracts
  $ 1,566,831     $ 1,334,322  
Billings on uncompleted contracts
    (1,559,077 )     (1,354,214 )
Excess of costs incurred and estimated earnings over billings (excess of billings over costs incurred and estimated earnings) on uncompleted contracts
  $ 7,754     $ (19,892 )
Schedule of Net Amount of Costs And Earnings on Uncompleted Contracts [Table Text Block]
   
As of December 31,
 
   
2014
   
2013
 
Costs and estimated earnings in excess of billings on uncompleted contracts
  $ 33,403     $ 11,684  
Billings in excess of costs and estimated earnings on uncompleted contracts
    (25,649 )     (31,576 )
Net amount of costs and estimated earnings on uncompleted contracts above (below) billings
  $ 7,754     $ (19,892 )