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Note 9 - Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
    Patents   Non-
Compete		   Customer
List		   Total
Estimated useful life   14 years   5 years   5 years    
Gross amount at September 30, 2016   $ 429     $ 512     $ 2,046     $ 2,987  
Accumulated amortization at September 30, 2016     (429 )     (434 )     (1,727 )     (2,590 )
Net balance at September 30, 2016   $ -     $ 78     $ 319     $ 397  
                                 
Gross amount at December 31, 2015   $ 429     $ 512     $ 2,046     $ 2,987  
Accumulated amortization at December 31, 2015     (429 )     (387 )     (1,535 )     (2,351 )
Net balance at December 31, 2015   $ -     $ 125     $ 511     $ 636  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Remainder of:    
2016     79  
2017     318  
Total   $ 397