Note 23 - Stock Option Activity (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Stock Option Activity [Abstract]
Shares Under Option, Outstanding | shares	5,195,937
Shares Under Option, Granted | shares	2,220,959
Shares Under Option, Forfeited | shares	573,817
Shares Under Option, Outstanding | shares	6,843,079
Shares Under Option, Exercisable | shares	6,050,372
Shares Under Option, Expected to vest | shares	792,707
Weighted Average Exercise Price Per Share, Outstanding | $ / shares	$ 13.85
Weighted Average Exercise Price Per Share, Granted | $ / shares	4.60
Weighted Average Exercise Price Per Share, Forfeited | $ / shares	12.50
Weighted Average Exercise Price Per Share, Outstanding | $ / shares	10.96
Weighted Average Exercise Price Per Share, Exercisable | $ / shares	11.18
Weighted Average Exercise Price Per Share, Expected to vest | $ / shares	$ 9.27
Weighted Average Remaining Contractual Life, Outstanding	4 years 25 days
Weighted Average Remaining Contractual Life, Exercisable	3 years 11 months 12 days
Weighted Average Remaining Contractual Life, Expected to vest	5 years 10 months 9 days
Aggregate Intrinsic Value, Outstanding | $	$ 2
Aggregate Intrinsic Value, Exercisable | $	$ 2