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Note 6 - Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2015
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year Ending December 31:   Amount
         
2015   $ 84  
2016     168  
2017     168  
2018     84  
Total minimum lease payments   $ 504