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Note 14 - Segment Reporting (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
CVD
    
SDC
    
Eliminations
    
Consolidated
  
Assets
   $
54,387,955
     $
4,902,027
     $
(311,732
 )   $
58,978,250
  
                                 
Revenue
   $
35,697,372
     $
7,426,890
     $
(1,995,623
 )   $
41,128,639
  
Interest Expense
    
106,280
      
--
      
 
      
106,280
  
Depreciation and Amortization
    
804,900
      
62,377
      
 
      
867,277
  
Capital expenditures
    
14,888,801
      
1,383
      
 
      
14,890,184
  
Pretax earnings/(loss)
    
5,227,131
      
1,968,224
      
 
      
7,195,355
  
   
CVD
    
SDC
    
Eliminations
    
Consolidated
  
Assets
   $
43,300,131
     $
4,558,111
     $
(2,253,550
 )   $
45,604,692
  
                                 
Revenue
   $
18,568,132
     $
2,934,831
     $
(547,616
 )   $
20,955,347
  
Interest Expense
    
78,322
      
1,539
      
 
      
79,861
  
Depreciation and
Amortization
    
750,680
      
62,978
      
 
      
813,658
  
Capital expenditures
    
606,643
      
5,850
      
 
      
612,493
  
Pretax
(loss)/earnings
   
(211,576
 )    
(441,610
 )    
 
      
(653,186
 )