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Note 8 - Geographic Segment Data (Tables)
9 Months Ended
Sep. 30, 2018
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,
 
   
2018
   
2017
   
2018
   
2017
 
                                 
United States
  $
7,736,000
    $
9,039,000
    $
29,549,000
    $
30,165,000
 
Europe
   
1,158,000
     
1,261,000
     
3,795,000
     
3,125,000
 
Mexico
   
2,396,000
     
2,627,000
     
6,959,000
     
6,605,000
 
United Kingdom
   
236,000
     
299,000
     
1,186,000
     
1,502,000
 
                                 
    $
11,526,000
    $
13,226,000
    $
41,489,000
    $
41,397,000
 
 
 
Total Assets at
 
    September 30,     December 31,  
   
2018
   
2017
 
                 
United States
  $
25,644,000
    $
27,784,000
 
Europe
   
3,043,000
     
2,989,000
 
Mexico
   
10,283,000
     
8,288,000
 
United Kingdom
   
1,089,000
     
923,000
 
                 
    $
40,059,000
    $
39,984,000