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Note 8 - Geographic Segment Data (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Net Sales to Outside Customers
 
   
For the Three Months Ended
 
   
March 31,
 
   
2020
   
2019
 
                 
United States
  $
5,426,000
    $
6,600,000
 
Mexico
   
1,642,000
     
2,080,000
 
                 
    $
7,068,000
    $
8,680,000
 
   
Total Assets at
 
    March 31,     December 31,  
   
2020
   
2019
 
                 
United States
  $
17,770,000
    $
19,668,000
 
Mexico
   
8,193,000
     
10,897,000
 
Assets Held for Sale International Subsidiaries
   
881,000
     
756,000
 
                 
    $
26,844,000
    $
31,321,000