Note 6 - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Deferred stock-based compensation expense	$ 9,059	$ 7,739
Goodwill and intangible assets	$ 10,449	10,416
Accounts receivable		2,576
Allowance for doubtful accounts	$ 1,766	1,473
Deferred rent	1,119	783
Tenant improvements	1,392	1,339
Net operating loss carry-forwards	113	122
Accrued expenses and other	6,298	3,337
Total deferred tax assets	30,196	27,785
Deferred tax liabilities:
Goodwill and intangible assets	54,586	61,328
Property and equipment	3,098	6,107
Capitalized software cost	3,473	3,392
Total deferred tax liabilities	61,157	70,827
Total net deferred tax liabilities	30,961	43,042
Net current deferred tax assets	(7,460)	(7,811)
Net non-current deferred tax liabilities	$ 38,421	$ 50,853