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Note 19 - Costs of Sales (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Costs of Sales [Table Text Block]
    2018   2017   2016
Direct costs of sales    
(13,683
 )    
(12,706
 )    
(11,161
 )
Indirect costs of sales    
(8,583
 )    
(8,232
 )    
(8,039
 )
Total costs of sales    
(22,266
 )    
(20,938
 )    
(19,200
 )