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Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) - Warranty Activity (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Warranty Activity [Abstract]    
Balance at the beginning of the period $ 75 $ 159
Accruals for warranties issued 16 16
Settlements made during the period (in cash or in kind) (16) (35)
Balance at the end of the period $ 75 $ 140