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Note 24 - Share-based Payments - Deferred Shares (Details) - Deferred stock units of Grant One [member]
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Deferred shares outstanding at January 1st 19,260,000 19,056,000 17,490,000
New deferred shares during the period 794,000 7,329,000 2,692,000
Deferred shares granted during the period (2,874,000) (6,118,000) (804,000)
Deferred shares forfeited during the period (880,000) (1,007,000) (322,000)
Deferred shares outstanding at ended year 16,300,000 19,260,000 19,056,000