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Note 4 - Inventories (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Inventory Current and Noncurrent [Table Text Block] |
|  | As of December 31, |
|  | 2018 |  |  | 2017 |
Current: |  |  |  |  |  |  |  |
Raw materials |  | $ | 1,795 |  |  | $ | 197 |
Finished goods |  |  | 11,433 |  |  |  | 14,218 |
Total |  | $ | 13,228 |  |  | $ | 14,415 |
Long-term: |  |  |  |  |  |  |  |
Raw materials |  | $ | 2,165 |  |  | $ | 2,682 |
Finished goods |  |  | 6,788 |  |  |  | 6,026 |
Total |  | $ | 8,953 |  |  | $ | 8,708 |

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