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Note 4 - Contracts in Progress (Tables)
 6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule Of Cost And Estimated Earnings In Excess Of Billings [Table Text Block]
   
June 30, 2016
    
December 31, 2015
  
                 
Costs incurred on contracts in progress
   $ 2,777,723     $ 7,695,281  
Estimated earnings
     12,890,347       7,635,114  
      15,668,070       15,330,395  
Billings to date
     (18,001,359 )     (10,695,377 )
    $ (2,333,289 )   $ 4,635,018  
Included in accompanying balance sheets
under the following captions:
                
Costs and estimated earnings in excess
of billings on contracts in progress
   $ 2,859,587     $ 4,635,018  
                 
Billings in excess of costs and estimated
earnings on contracts in progress
   $ (5,192,876 )   $ ---  
    $ (2,333,289 )   $ 4,635,018