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Note 3 - Trade Accounts and Notes Receivable, Net (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
    December 31,
    2019   2018
Trade accounts receivable    
11,807
     
12,907
 
Notes receivable    
1,013
     
408
 
Less: allowance for doubtful accounts    
(1,490
)    
(1,405
)
Total    
11,330
     
11,910
 
Less current portion    
(11,328
)    
(11,884
)
Total long-term portion    
2
     
26
 
Schedule of Financing Receivables, Minimum Payments [Table Text Block]
    Sales type
leases
2020    
12
 
2021    
2
 
2022    
-
 
2023    
-
 
2024    
-
 
Total minimum payments    
14