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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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Warranty Activity [Abstract]        
Balance at the beginning of the period $ 68 $ 150 $ 75 $ 159
Accruals for warranties issued 32 7 48 46
Settlements made during the period (in cash or in kind) (24) (17) (47) (65)
Balance at the end of the period $ 76 $ 140 $ 76 $ 140