Note 16 - Stock-based Compensation - Summary of the Status of the 2012 Incentive Plan (Details) - $ / shares		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Outstanding at beginning of year (in shares)		3,300
Outstanding at beginning of year (in dollars per share)		$ 2,438
Outstanding at end of year (in shares)		4,100	3,300
Outstanding at end of year (in dollars per share)			$ 2,438
2012 Incentive Plan [Member]
Outstanding at beginning of year (in shares)		2,438	4,477	4,710
Outstanding at beginning of year (in dollars per share)		$ 25.38	$ 27.48	$ 28.23
Stock Options (in shares)		1,155	45	485
Stock Options (in dollars per share)		$ 43.01	$ 38.24	$ 29.05
SARs* (in shares)	[1]
SARs* (in dollars per share)	[1]
Exercised (in shares)		(967)	(1,589)	(243)
Exercised (in dollars per share)		$ 25.33	$ 26.77	$ 24.10
Forfeited (in shares)		(57)	(125)	(116)
Forfeited (in dollars per share)		$ 24.12	$ 27.33	$ 23.20
Expired (in shares)		(4)	(370)	(359)
Expired (in dollars per share)		$ 26.84	$ 45.78	$ 42.70
Outstanding at end of year (in shares)		2,565	2,438	4,477
Outstanding at end of year (in dollars per share)		$ 33.36	$ 25.38	$ 27.48
Options and SARs exercisable at end of year (in shares)		557	858	2,106
Options and SARs exercisable at end of year (in dollars per share)		$ 25.22	$ 26.75	$ 31.25
Weighted-average fair value of options and SARs granted during the year (in dollars per share)		$ 11.61	$ 8.68	$ 9

[1] Upon exercise, SARs entitle the recipient to receive shares of common stock equal to the increase in value of the award between the grant date and the exercise date.