Note 5 - Balance Sheet Components (Details) - Accrued Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	$ 14,703	$ 17,376
Proceeds From Litigation [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities		9,489
Dividends and Dividend Equivalents [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	6,080
Deferred Revenue And Customer Prepayments [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	3,908	2,523
Stock Rotation Reserve [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	1,757	1,459
Commissions [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	767	931
Sales Rebate [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	586	900
Warranty [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	240	451
Other Liability [Member]
Note 5 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued liabilities	$ 1,365	$ 1,623