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Note 18 - Geographic Segment Data (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
United States
    
United Kingdom
(UK)
    
Europe
(Excluding
UK)
    
Mexico
    
Consolidated
  
Year ended 12/31/1
7
                                        
Sales to outside customers
   $
41,165,000
     $
1,908,000
     $
4,142,000
     $
9,022,000
     $
56,237,000
  
Total Assets
   $
27,784,000
     $
923,000
     $
2,989,000
     $
8,288,000
     $
39,984,000
  
   
United States
    
United Kingdom
(UK)
    
Europe
(Excluding
UK)
    
Mexico
    
Consolidated
  
Year ended 12/31/1
6
                                        
Sales to outside customers
   $
51,792,000
     $
2,427,000
     $
2,590,000
     $
7,459,000
     $
64,268,000
  
Total Assets
   $
33,108,000
     $
1,324,000
     $
2,418,000
     $
7,064,000
     $
43,914,000