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Note 4 - Contracts in Progress (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule Of Cost And Estimated Earnings In Excess Of Billings [Table Text Block]
   
September
30, 2017
    
December 31, 201
6
  
                 
Costs incurred on contracts
in progress
   $
11,557,916
     $
4,678,192
  
Estimated earnings
    
19,302,951
      
10,733,826
  
     
30,876,962
      
15,412,018
  
Less:
Billings to date
    
26,634,938
      
(18,077,839
 )
                 
Included in accompanying balance sheets under the following captions:
   $
4,242,024
     $
(2,665,821
 )
                 
Costs and estimated earnings in excess of billings on contracts in progress
   $
4,457,926
     $
2,596,518
  
                 
Billings in excess of costs and estimated earnings on contracts in progress
    
(215,902
 )    
(5,262,339
 )
    $
4,242,024
     $
(2,665,821
 )