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Note 12 - Segment and Geographic Data (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Sales
  
Three months ended June 30
    
Six months ended June 30
  
Net Sales:
  
2018
    
2017
    
2018
    
2017
  
Dental
   $
2,388,898
     $
2,523,750
     $
4,158,003
     $
6,212,738
  
Medical
    
39,600
      
-
      
76,100
      
-
  
Total
   $
2,428,498
     $
2,523,750
     $
4,234,103
     $
6,212,738
  
                                 
Operating  Income (Loss):
  
2018
    
2017
    
2018
    
2017
  
Dental
   $
723,084
     $
697,618
     $
1,080,249
     $
1,973,250
  
Medical
    
(846,164
 )    
(604,131
 )    
(1,554,546
 )    
(1,228,457
 )
Corporate
    
(1,301,607
 )    
(1,645,922
 )    
(2,952,043
 )    
(2,823,167
 )
Total
   $
(1,424,687
 )   $
(1,552,435
 )   $
(3,426,340
 )   $
(2,078,374
 )
                                 
Depreciation and Amortization:
  
2018
    
2017
    
2018
    
2017
  
Dental
   $
4,103
     $
4,458
     $
8,244
     $
8,926
  
Medical
    
2,478
      
6,561
      
19,355
      
15,921
  
Corporate
    
238,546
      
20,826
      
482,519
      
41,540
  
Total
   $
245,127
     $
31,845
     $
510,118
     $
66,387
  
                                 
Income (Loss) before taxes and equity in earnings of affiliates:
  
2018
    
2017
    
2018
    
2017
  
Dental
   $
725,007
     $
699,737
     $
1,084,829
     $
1,975,836
  
Medical
    
(846,737
 )    
(649,726
 )    
(1,555,691
 )    
(1,274,522
 )
Corporate
    
(1,302,787
 )    
(1,601,316
 )    
(2,954,345
 )    
(2,779,009
 )
Total
   $
(1,424,517
 )   $
(1,551,305
 )   $
(3,425,207
 )   $
(2,077,695
 )
                                 
Total Assets:
    
 
      
 
    
June 30,2018
    
December 31, 2017
  
Dental
    
 
      
 
     $
9,746,910
     $
10,255,144
  
Medical
    
 
      
 
      
361,949
      
655,513
  
Corporate
    
 
      
 
      
3,320,630
      
4,718,130
  
     
 
      
 
     $
13,429,489 
     $
15,628,787
  
Sales by Product and by Geographical Region [Table Text Block]
   
Three months ended June 30,
    
Six months ended June 30,
  
Domestic-US & Canada
  
2018
    
2017
    
2018
    
2017
  
Devices
   $
11,505
     $
219,648
     $
132,553
     $
405,293
  
Handpieces
    
1,158,975
      
1,182,985
      
1,927,506
      
2,693,471
  
Other
    
22,377
      
21,509
      
51,228
      
40,449
  
Total Domestic US & Canada
   $
1,192,857
     $
1,424,142
     $
2,111,287
     $
3,139,213
  
International ROW
                                
Devices
   $
367,450
     $
353,805
     $
652,518
     $
712,475
  
Handpieces
    
839,194
      
362,437
      
1,418,021
      
945,786
  
Other
    
28,997
      
26,966
      
52,277
      
57,064
  
Total International-ROW
   $
1,235,641
     $
743,208
     $
2,122,816
     $
1,715,325
  
International-China
                                
Devices
   $
-
     $
-
     $
-
     $
1,000,000
  
Handpieces
    
-
      
356,400
      
-
      
356,400
  
Other
    
-
      
-
      
-
      
1,800
  
Total International
   $
-
     $
356,400
     $
-
     $
1,358,200
  
Sales by region                                
Domestic-US & Canada
   $
1,192,857
     $
1,424,142
     $
2,111,287
     $
3,139,213
  
International -ROW
    
1,235,641
      
743,208
      
2,122,816
      
1,715,325
  
International -China
    
-
      
356,400
      
-
      
1,358,200
  
Total Product Sales
   $
2,428,498
     $
2,523,750
     $
4,234,103
     $
6,212,738