Note 4 - Accrued Liabilities (Detail) - Accrued Liabilities (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Accrued Liabililties	$ 6,848	$ 7,845
Deferred Revenue And Customer Prepayments [Member]
Accrued Liabililties	2,820	3,603
Stock Rotation Reserve [Member]
Accrued Liabililties	1,203	1,086
Legal Expenses And Settlement Cost [Member]
Accrued Liabililties	607	911
Warranty [Member]
Accrued Liabililties	443	561
Other Liability [Member]
Accrued Liabililties	$ 1,775	$ 1,684