Note 15 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Feb. 03, 2018	Jan. 28, 2017
Deferred tax assets:
Net operating loss	$ 11,049	$ 8,526
Investment impairment	330	545
Allowance, reserve and other	1,314	3,173
Tax credits	33,147	14,790
Share-based compensation	2,645	6,602
Other	111
Total gross deferred tax assets	48,596	33,636
Valuation allowance	(48,630)	(31,076)
Total deferred tax (liabilities) assets	(34)	2,560
Deferred tax liabilities:
Depreciation	(11)	(206)
Unrealized foreign exchange loss		(594)
Acquired intangibles and other		(2,080)
Net deferred tax liabilities	$ (45)	$ (320)