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Note 8 - Geographic Segment Data (Tables)
9 Months Ended
Sep. 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 Nine Months Ended
 
   
September 30,
   
September 30,
 
   
2019
   
2018
   
2019
   
2018
 
                                 
United States
  $
5,126,000
    $
7,735,000
    $
22,980,000
    $
29,549,000
 
Europe
   
1,002,000
     
1,158,000
     
3,361,000
     
3,795,000
 
Mexico
   
2,245,000
     
2,396,000
     
6,348,000
     
6,959,000
 
United Kingdom
   
164,000
     
236,000
     
792,000
     
1,186,000
 
                                 
    $
8,537,000
    $
11,525,000
    $
33,481,000
    $
41,489,000
 
   
Total Assets at
 
   
September 30,
    December 31,  
   
2019
   
2018
 
                 
United States
  $
17,841,000
    $
25,354,000
 
Europe
   
2,805,000
     
3,052,000
 
Mexico
   
11,260,000
     
9,476,000
 
United Kingdom
   
991,000
     
879,000
 
                 
    $
32,897,000
    $
38,761,000