Note 5 - Accrued Liabilities (Detail) - Accrued Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrued Liabililties	$ 5,915	$ 7,845
Deferred Revenue And Customer Prepayments [Member]
Accrued Liabililties	2,198	3,603
Stock Rotation Reserve [Member]
Accrued Liabililties	961	1,086
Legal Expenses And Settlement Cost [Member]
Accrued Liabililties	402	911
Warranty [Member]
Accrued Liabililties	331	561
Other Liability [Member]
Accrued Liabililties	$ 2,023	$ 1,684