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Note 4 - Revenue Disaggregation (Tables)
 3 Months Ended
Mar. 31, 2021
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three Month's Ending March 31, 2021
  
                         
   
Over time
    
Point in time
    
Total
  
Aerospace
   $
189
     $
526
     $
715
  
Industrial
   $
1,369
     $
675
     $
2,044
  
Research
   $
187
     $
420
     $
607
  
Total
   $
1,745
     $
1,621
     $
3,366
  
   
Three Month's Ending March 31, 2020
  
                         
   
Over time
    
Point in time
    
Total
  
Aerospace
   $
1,165
     $
2,185
     $
3,350
  
Industrial
   $
127
     $
861
     $
988
  
Research
   $
594
     $
1,104
     $
1,698
  
Total
   $
1,886
     $
4,150
     $
6,036
  
Schedule Of Cost And Estimated Earnings In Excess Of Billings [Table Text Block]
   
2021
  
Costs incurred on contracts in progress
   $
5,266,960
  
Estimated earnings
    
2,503,933
  
     
7,770,893
  
Billings to date
    
(6,867,896
 )
    $
902,997
  
Deferred revenue related to non-systems contracts
    
(609,216
 )
     
293,781
  
Included in accompanying balance sheets
        
Under the following captions:
        
Contract assets
   $
1,027,288
  
Contract liabilities
   $
(733,507
 )