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Note 11 - Segment Reporting (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
2017
  
CVD
    
SDC
    
Eliminations *
    
Consolidated
  
Revenue
   $
8,581,663
     $
2,032,171
     $
(963,217
 )   $
9,650,617
  
Pretax (loss)/income
   
1,105,414
      
602,752
      
 
      
1,708,166
  
                                 
2016
                                
Revenue
   $
4,092,781
     $
923,979
     $
(13,327
 )   $
5,003,433
  
Pretax income
    
(605,605
 )    
64,151
      
 
      
(541,454
 )