Note 3 - Balance Sheet Details - Selected Balance Sheet Items (Details) (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Allowance for accounts receivable	$ 10,803	$ 8,538
Inventory loss provisions	$ 7,750	$ 9,453

Amount of valuation reserve for inventory.

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Name:	us-gaap_InventoryValuationReserves
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant