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Note 2 - Cash Equivalents (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Cash and Cash Equivalents [Table Text Block]
    December 31,
    2018   2017
Total cash and cash equivalents    
19.464
     
20,004
 
Short term investments    
     
 
Total cash and cash equivalents, and short term investments    
19,464
     
20,004