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Note 9 - Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2017   $
429
     $
512
     $
2,046
     $
2,987
  
Accumulated amortization at September 30, 2017    
(429
 )    
(496
 )    
(1,983
 )   $
(2,908
 )
Net balance at September 30, 2017   $
-
     $
16
     $
63
     $
79
  
                                 
Estimated useful life (in years)    
14
      
5
      
5
     
 
  
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