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Note 10 - Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2013
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]
Balance at December 31, 2012
  $ 607  
Accruals for warranties issued
    120  
Settlements made
    (46 )
Balance at June 30, 2013
  $ 681