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Note 12 - Segment and Related Information (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
June 30
    
June 30
  
   
2018
    
2017
    
2018
    
2017
  
                                 
Sales
 
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Commercial Air Handling
   $
10,884,324
     $
3,343,945
     $
20,000,261
     $
3,343,945
  
Test and Measurement
    
924,598
      
2,452,854
      
1,996,445
      
4,222,925
  
Industrial Hose
    
1,784,270
      
1,423,827
      
3,475,186
      
3,000,071
  
Total Sales
   $
13,593,192
     $
7,220,626
     $
25,471,892
     $
10,566,941
  
                                 
Income Before Provision for Income Taxes
 
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Commercial Air Handling
    
1,765,374
      
607,471
      
2,630,579
      
607,471
  
Test and Measurement
    
(96,172
)
    
343,752
      
(225,121
)
    
440,885
  
Industrial Hose
    
123,964
      
27,673
      
224,153
      
151,807
  
Loss on sale of business
    
(1,160,574
)
    
-
      
(1,160,574
)
    
-
  
General Corporate Expenses
    
(106,426
)
    
-
      
(444,535
 )    
-
  
Income Before Provision for Income Taxes
   $
526,166
     $
978,896
     $
1,024,502
     $
1,200,163