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Note 5 - Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
    Patents   Non-
Compete		   Customer
List		   Total
Estimated useful life (in years)    
14
      
5
      
5
      
 
  
Gross amount at December 31, 2017   $
429
     $
512
     $
2,046
     $
2,987
  
Accumulated amortization at December 31, 2017    
(429
 )    
(512
 )    
(2,046
 )   $
(2,987
 )
Net balance at December 31, 2017   $
-
     $
-
     $
-
     $
-
  
                                 
Gross amount at December 31, 2016   $
429
     $
512
     $
2,046
     $
2,987
  
Accumulated amortization at December 31, 2016    
(429
 )    
(449
 )    
(1,791
 )    
(2,669
 )
Net balance at December 31, 2016   $
-
     $
63
     $
255
     $
318