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Note 13 - Segment and Related Information (Tables)
 3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Three Months Ended March 31, 2021
  
   
Commercial
Air Handling
    
Industrial
And
Transportation
Products
    
Corporate
and Other
    
Consolidated
  
Sales
   $
8,765,099
     $
15,228,905
     $
-
     $
23,994,004
  
Gross Profit
    
2,230,821
      
3,772,100
      
-
      
6,002,921
  
Operating Income
    
1,045,631
      
1,751,443
      
(471,614
 )    
2,325,460
  
Pretax Income
    
1,045,631
      
3,025,970
      
(402,642
 )    
3,668,959
  
Net Income
    
784,224
      
2,660,019
      
(300,826
 )    
3,143,417
  
   
Three Months Ended March 31, 2020 (1)
  
   
Commercial
Air Handling
    
Industrial
And
Transportation
Products
    
Corporate
and Other
    
Consolidated
  
Sales
   $
11,453,774
     $
13,827,800
     $
-
     $
25,281,574
  
Gross Profit
    
3,047,801
      
3,160,342
      
-
      
6,208,143
  
Operating Income
    
1,619,769
      
1,414,604
      
103,776
      
3,138,149
  
Pretax Income
    
1,594,804
      
1,121,227
      
53,336
      
2,769,367
  
Net Income
    
1,196,102
      
839,496
      
39,972
      
2,075,570