Note 4 - Accrued Liabilities (Detail) - Accrued Liabilities (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accrued Liabililties	$ 7,500	$ 7,845
Deferred Revenue And Customer Prepayments [Member]
Accrued Liabililties	2,950	3,603
Stock Rotation Reserve [Member]
Accrued Liabililties	1,413	1,086
Legal Expenses And Settlement Cost [Member]
Accrued Liabililties	446	911
Warranty [Member]
Accrued Liabililties	859	561
Other Liability [Member]
Accrued Liabililties	$ 1,832	$ 1,684