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Note 20 - Stock Option Activity (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Stock Option Activity [Abstract]  
Shares Under Option, Outstanding | shares 2,214,459
Shares Under Option, Granted | shares 2,605,051
Shares Under Option, Forfeited | shares 11,655
Shares Under Option, Outstanding | shares 4,807,855
Shares Under Option, Exercisable | shares 1,400,690
Shares Under Option, Expected to vest | shares 3,407,165
Weighted Average Exercise Price Per Share, Outstanding | $ / shares $ 17.10
Weighted Average Exercise Price Per Share, Granted | $ / shares 11.93
Weighted Average Exercise Price Per Share, Forfeited | $ / shares 16.80
Weighted Average Exercise Price Per Share, Outstanding | $ / shares 14.30
Weighted Average Exercise Price Per Share, Exercisable | $ / shares 18.73
Weighted Average Exercise Price Per Share, Expected to vest | $ / shares $ 12.48
Weighted Average Remaining Contractual Life, Outstanding 5 years 9 months
Weighted Average Remaining Contractual Life, Exercisable 4 years 3 months 21 days
Weighted Average Remaining Contractual Life, Expected to vest 6 years 3 months 10 days
Aggregate Intrinsic Value, Outstanding | $ $ 0
Aggregate Intrinsic Value, Exercisable | $ 0
Aggregate Intrinsic Value, Expected to vest | $ $ 0