Note 7 - Term Loans and Convertible Promissory Notes - Convertible Promissory Notes (Details) - USD ($) $ in Thousands |
Sep. 30, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Convertible note payable | $ 6,350 | $ 4,500 |
| Convertible Note Payable, One [Member] | ||
| Convertible note payable | 1,500 | |
| Convertible Note Payable Two [Member] | ||
| Convertible note payable | 1,500 | |
| Convertible Note Payable, Three [Member] | ||
| Convertible note payable | 1,500 | 1,500 |
| Convertible Note Payable, Four [Member] | ||
| Convertible note payable | 1,500 | |
| Convertible Note Payable Five [Member] | ||
| Convertible note payable | 2,000 | |
| Convertible Note Payable Six [Member] | ||
| Convertible note payable | 500 | |
| Convertible Note Payable Seven [Member] | ||
| Convertible note payable | 250 | |
| Convertible Note Payable Eight [Member] | ||
| Convertible note payable | 350 | |
| Convertible Note Payable Nine [Member] | ||
| Convertible note payable | $ 250 |