Note 4 - Accrued Liabilities (Details) - Accrued Liabilities (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Note 4 - Accrued Liabilities (Details) - Accrued Liabilities [Line Items]
Accrued Liabililties	$ 9,245	$ 5,915
Deferred Revenue And Customer Prepayments [Member]
Note 4 - Accrued Liabilities (Details) - Accrued Liabilities [Line Items]
Accrued Liabililties	2,736	2,198
Stock Rotation Reserve [Member]
Note 4 - Accrued Liabilities (Details) - Accrued Liabilities [Line Items]
Accrued Liabililties	1,851	961
Sales Rebate [Member]
Note 4 - Accrued Liabilities (Details) - Accrued Liabilities [Line Items]
Accrued Liabililties	1,480	575
Commissions [Member]
Note 4 - Accrued Liabilities (Details) - Accrued Liabilities [Line Items]
Accrued Liabililties	629	464
Legal Expenses And Settlement Cost [Member]
Note 4 - Accrued Liabilities (Details) - Accrued Liabilities [Line Items]
Accrued Liabililties	565	402
Warranty [Member]
Note 4 - Accrued Liabilities (Details) - Accrued Liabilities [Line Items]
Accrued Liabililties	383	331
Other Liability [Member]
Note 4 - Accrued Liabilities (Details) - Accrued Liabilities [Line Items]
Accrued Liabililties	$ 1,601	$ 984