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Note 11 - Segment and Related Information (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
  
   
March 31
  
   
2018
    
2017
  
                 
Sales
 
 
 
 
  
 
 
 
Commercial Air Handling
   $
9,115,937
     $
-
  
Test and Measurement
    
1,071,847
      
1,770,071
  
Industrial Hose
    
1,690,916
      
1,576,244
  
Total Sales
   $
11,878,700
     $
3,346,315
  
                 
Income Before Provision for Income Taxes
 
 
 
 
  
 
 
 
Commercial Air Handling
    
865,205
      
-
  
Test and Measurement
    
(128,949
 )    
734,228
  
Industrial Hose
    
100,189
      
425,970
  
General Corporate Expenses
    
(338,109
 )    
(938,931
)
Income Before Provision for Income Taxes
   $
498,336
     $
221,267