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Note 2 - Cash Equivalents (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Cash and Cash Equivalents [Table Text Block]
    December 31,
    2019   2018
Total cash and cash equivalents    
20,886
     
19,464
 
Short term investments    
-
     
-
 
Total cash and cash equivalents, and short term investments    
20,886
     
19,464