Note 21 - Stock Based Compensation - Outstanding and Exercisable Stock Options (Details)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Options Outstanding Number Outstanding (in shares) | shares	5,531,882
Options Outstanding Weighted Average Remaining Contractual Life (Year)	4 years 328 days
Options Outstanding Weighted Average Exercise Price (in dollars per share)	$ 25.38
Options Exercisable Number Outstanding (in shares) | shares	5,084,158
Options Exercisable Weighted Average Remaining Contractual Life (Year)	4 years 197 days
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 24.98
Exercise Price Range 1 [Member]
Range of Exercise Price, Lower (in dollars per share)	15.01
Range of Exercise Price, Upper (in dollars per share)	$ 20
Options Outstanding Number Outstanding (in shares) | shares	45,090
Options Outstanding Weighted Average Remaining Contractual Life (Year)	2 years 277 days
Options Outstanding Weighted Average Exercise Price (in dollars per share)	$ 19.25
Options Exercisable Number Outstanding (in shares) | shares	45,090
Options Exercisable Weighted Average Remaining Contractual Life (Year)	2 years 277 days
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 19.25
Exercise Price Range 2 [Member]
Range of Exercise Price, Lower (in dollars per share)	20.01
Range of Exercise Price, Upper (in dollars per share)	$ 25
Options Outstanding Number Outstanding (in shares) | shares	1,343,079
Options Outstanding Weighted Average Remaining Contractual Life (Year)	3 years 222 days
Options Outstanding Weighted Average Exercise Price (in dollars per share)	$ 21.72
Options Exercisable Number Outstanding (in shares) | shares	1,306,223
Options Exercisable Weighted Average Remaining Contractual Life (Year)	3 years 189 days
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 21.72
Exercise Price Range 3 [Member]
Range of Exercise Price, Lower (in dollars per share)	25.01
Range of Exercise Price, Upper (in dollars per share)	$ 30
Options Outstanding Number Outstanding (in shares) | shares	3,313,823
Options Outstanding Weighted Average Remaining Contractual Life (Year)	5 years 83 days
Options Outstanding Weighted Average Exercise Price (in dollars per share)	$ 25.62
Options Exercisable Number Outstanding (in shares) | shares	3,302,955
Options Exercisable Weighted Average Remaining Contractual Life (Year)	5 years 83 days
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 25.62
Exercise Price Range 4 [Member]
Range of Exercise Price, Lower (in dollars per share)	30.01
Range of Exercise Price, Upper (in dollars per share)	$ 35
Options Outstanding Number Outstanding (in shares) | shares	829,890
Options Outstanding Weighted Average Remaining Contractual Life (Year)	5 years 299 days
Options Outstanding Weighted Average Exercise Price (in dollars per share)	$ 30.70
Options Exercisable Number Outstanding (in shares) | shares	429,890
Options Exercisable Weighted Average Remaining Contractual Life (Year)	2 years 178 days
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 30.62