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Note 13 - Segment and Related Information (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
  
   
March 31
  
   
2019
    
2018
  
                 
Sales
 
 
 
 
  
 
 
 
Commercial Air Handling
   $
11,744,561
     $
9,115,937
  
Test and Measurement
    
274,032
      
1,071,847
  
Industrial Hose
    
1,797,091
      
1,690,916
  
Aerospace Components
    
8,020,403
      
-
  
Total Sales
   $
21,836,087
     $
11,878,700
  
                 
Gross Profit
 
 
 
 
  
 
 
 
Commercial Air Handling
   $
3,001,933
     $
2,147,125
  
Test and Measurement
    
45,214
      
475,026
  
Industrial Hose
    
525,735
      
396,290
  
Aerospace Components
    
1,257,006
      
-
  
Total Gross Profit
   $
4,829,888
     $
3,018,441
  
                 
Operating Income
 
 
 
 
  
 
 
 
Commercial Air Handling
   $
1,782,987
     $
880,106
  
Test and Measurement
    
45,214
      
(110,031
)
Industrial Hose
    
248,291
      
140,012
  
Aerospace Components
    
759,609
      
-
  
Unallocated Corporate General
    
(265,030
)
    
(267,002
)
Total Operating Income
   $
2,571,071
     $
643,085
  
                 
Income Before Provision for Income Taxes
 
 
 
 
  
 
 
 
Commercial Air Handling
   $
1,782,696
     $
865,205
  
Test and Measurement
    
45,214
      
(128,949
)
Industrial Hose
    
192,479
      
100,189
  
Aerospace Components
    
562,956
      
-
  
Loss on sale of business
    
-
      
-
  
Unallocated Corporate General & Other
    
(254,473
)
    
(338,109
)
Income Before Provision for Income Taxes
   $
2,328,872
     $
498,336