Note 3 - Balance Sheet Components (Details) - Accrued Liabilities (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	$ 15,605	$ 17,376
Proceeds From Litigation [Member]
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities		9,489
Dividends and Dividend Equivalents [Member]
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	5,893
Deferred Revenue And Customer Prepayments [Member]
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	4,204	2,523
Commissions [Member]
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	1,234	931
Stock Rotation Reserve [Member]
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	1,224	1,459
Sales Rebate [Member]
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	1,154	900
Warranty [Member]
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	290	451
Other Liability [Member]
Note 3 - Balance Sheet Components (Details) - Accrued Liabilities [Line Items]
Accrued Liabilities	$ 1,606	$ 1,623