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Note 6 - Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

Year Ending December 31,

       

2015 (remaining 6 months)

  $ 112  

2016

    229  

2017

    58  

Total minimum lease payments

  $ 399