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Note 3 - Contracts in Progress (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule Of Cost And Estimated Earnings In Excess Of Billings [Table Text Block]
   
2016
    
2015
  
Costs incurred on contracts in progress
   $
4,678,192
     $
7,695,281
  
Estimated earnings
    
10,733,826
      
7,635,114
  
     
15,412,018
      
15,330,395
  
Billings to date
    
(18,077,839
 )    
(10,695,377
 )
    $
(2,665,821
 )   $
4,635,018
  
   
2016
    
2015
  
Included in accompanying balance sheets
                
Under the following captions:
                
Costs and estimated earnings in excess of billings on contracts in progress
   $
2,596,518
     $
4,635,018
  
                 
Billings in excess of costs and estimated earnings on contracts in progress
   $
(5,262,339
 )   $
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