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Note 12 - Mezzanine Equity (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Temporary Equity [Table Text Block]
Series B convertible preferred stock
Total
Balance December 31, 2016
1,741
Conversions of Series B convertible preferred stock to common stock
(1,372)
Balance June 30, 2017
369