Note 12 - Income Taxes (Details) - Deferred Taxes - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Allowance for doubtful accounts	$ 3,937	$ 3,607
Basis difference on intangible assets	22,555	7,623
Net operating loss carryforwards	386	2,334
Share-based compensation	11,326	10,462
Foreign currency translation	4,037	7,805
Tax credits	2,699	683
Other deferred tax assets	3,270	1,903
Total deferred tax assets	48,210	34,417
Deferred tax liabilities:
Basis difference of property and equipment	(485)	(227)
Cash to accrual and other method adjustments	(597)	(166)
Other deferred tax liabilities	(56)	(566)
Total deferred tax liabilities	(1,138)	(959)
Net deferred tax asset	$ 47,072	$ 33,458