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Note 3 - Contracts in Progress (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule Of Cost And Estimated Earnings In Excess Of Billings [Table Text Block]
   
2017
    
2016
  
Costs incurred on
contracts in progress
   $
22,079,680
     $
4,678,192
  
Estimated earnings
    
16,499,697
      
10,733,826
  
     
38,579,377
      
15,412,018
  
Billings to date
    
(30,648,666
 )    
(18,077,839
 )
    $
7,930,711
     $
(2,665,821
 )
   
2017
    
2016
  
Included in accompanying balance sheets
                
Under the following captions:
                
Costs and estimated earnings in excess of billings on contracts in progress
   $
8,397,024
     $
2,596,518
  
                 
Billings in excess of costs and estimated earnings on contracts in progress
   $
(466,313
 )   $
(5,262,339
 )