Note 9 - 401(k) Profit Sharing, Deferred Compensation and Long-term Incentive Plans (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 5.4	$ 5.3	$ 3.2
Other Noncurrent Liabilities [Member]
Deferred Compensation Liability, Classified, Noncurrent	$ 23.5	$ 19.7
Minimum [Member]
Deferred Compensation Arrangement with Individual, Requisite Service Period		1 year
Maximum [Member]
Deferred Compensation Arrangement with Individual, Requisite Service Period		7 years