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Note 4 - Accrued Liabilities (Detail) - Accrued Liabilities (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accrued Liabililties	$ 7,679	$ 5,915
Deferred Revenue And Customer Prepayments [Member]
Accrued Liabililties	2,885	2,198
Stock Rotation Reserve [Member]
Accrued Liabililties	1,554	961
Legal Expenses And Settlement Cost [Member]
Accrued Liabililties	599	402
Warranty [Member]
Accrued Liabililties	275	331
Other Liability [Member]
Accrued Liabililties	$ 2,366	$ 2,023

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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