Note 4 - Balance Sheet Components (Details) - Accrued Liabilities (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Note 4 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	$ 15,528	$ 17,376
Proceeds From Litigation [Member]
Note 4 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities		9,489
Dividends and Dividend Equivalents [Member]
Note 4 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	5,994
Deferred Revenue And Customer Prepayments [Member]
Note 4 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	4,110	2,523
Stock Rotation Reserve [Member]
Note 4 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	2,095	1,459
Commissions [Member]
Note 4 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	1,228	931
Sales Rebate [Member]
Note 4 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	451	900
Warranty [Member]
Note 4 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	240	451
Other Liability [Member]
Note 4 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	$ 1,410	$ 1,623