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Note 24 - Share-based Payments - Deferred Shares (Details)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred stock units of Grant One [member]      
Statement Line Items [Line Items]      
Shares outstanding at January 1st 16,300,000 19,260,000 19,056,000
New shares during the period 426,000 794,000 7,329,000
Shares granted during the period (3,429,000) (2,874,000) (6,118,000)
Shares forfeited during the period (989,000) (880,000) (1,007,000)
Shares outstanding at ended year 12,308,000 16,300,000 19,260,000
Restricted shares [member]      
Statement Line Items [Line Items]      
Shares outstanding at January 1st    
New shares during the period 13,055,000    
Shares granted during the period (296,000)    
Shares forfeited during the period (103,000)    
Shares outstanding at ended year 12,656,000