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Note 6 - Commitments and Contingencies (Details) - Changes in Product Warranty Liability (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Changes in Product Warranty Liability [Abstract]    
Balance $ 607 $ 839
Accruals for warranties issued 20 370
Settlements made (114) (602)
Balance $ 513 $ 607