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Note 8 - Geographic Segment Data (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Net Sales to Outside Customers
   
Net Sales to Outside Customers
 
   
For the Three Months Ended
   
For the Six Months Ended
 
   
June 30,
   
June 30,
 
   
2019
   
2018
   
2019
   
2018
 
                                 
United States
  $
9,095,000
    $
12,075,000
    $
17,855,000
    $
21,813,000
 
Europe
  $
1,083,000
     
1,275,000
    $
2,358,000
     
2,637,000
 
Mexico
  $
2,022,000
     
2,378,000
    $
4,103,000
     
4,564,000
 
United Kingdom
  $
207,000
     
257,0000
    $
627,000
     
950,000
 
                                 
    $
12,407,000
    $
15,985,000
    $
24,943,000
    $
29,964,000
 
   
Total Assets at
 
    June 30,     December 31,  
   
2019
   
2018
 
                 
United States
  $
22,907,000
    $
25,354,000
 
Europe
  $
3,105,000
     
3,052,000
 
Mexico
  $
11,490,000
     
9,476,000
 
United Kingdom
  $
1,146,000
     
879,000
 
Reserve
  $
(3,000,000
)    
-
 
    $
35,648,000
    $
38,761,000