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Note 16 - Fair Value Measurement (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
March 31, 2019
 
   
Fair Value Measurement Using
   
Liabilities at Fair
 
   
Level 1
   
Level 2
   
Level 3
   
value
 
Derivative Instrument liability
                               
                                 
Total Liabilities
  $       $
353
    $       $
353
 
   
December 31, 2018
 
   
Fair Value Measurement Using
   
Liabilities at Fair
 
   
Level 1
   
Level 2
   
Level 3
   
value
 
Derivative Instrument liability
                               
                                 
Total Liabilities
  $       $
1,276
    $       $
1,276