Note 6 - Term Loans and Convertible Promissory Notes - Convertible Promissory Notes (Details) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Convertible Note Payable, One [Member] | ||
| Maturity date | Mar. 29, 2019 | Mar. 29, 2019 |
| Debt Instrument, Interest Rate, Stated Percentage | 8.00% | 8.00% |
| Convertible Note Payable Two [Member] | ||
| Maturity date | Sep. 27, 2019 | Sep. 27, 2019 |
| Debt Instrument, Interest Rate, Stated Percentage | 8.00% | 8.00% |
| Convertible Note Payable, Three [Member] | ||
| Maturity date | Dec. 21, 2019 | Dec. 21, 2019 |
| Debt Instrument, Interest Rate, Stated Percentage | 8.00% | 8.00% |