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Note 13 - Warrants and Derivative Liabilities (Tables) | 6 Months Ended
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Sep. 30, 2019
Notes Tables |
Fair Value Option, Disclosures [Table Text Block] |
|  | September 30, |  |  | June 30, |
Fiscal Year 2019 |  |  | 2019 |  |  |  | 2019 |
Risk-free interest rate |  |  | 1.90 | % |  |  | 2.11 | %
Expected annual dividend yield |  |  | — |  |  |  | — |
Expected volatility |  |  | 62.84 | % |  |  | 60.58 | %
Term (years) |  |  | 0.12 |  |  |  | 0.37 |
Fair value |  | $0.6 million |  |  | $1.7 million |
|  | March 31, |  | December 31, |  | September 30, |  | June 30, |  | March 31,
Fiscal Year 2018 |  | 2019 |  | 2018 |  | 2018 |  | 2018 |  | 2018
Risk-free interest rate |  | 2.43% |  | 2.61% |  | 2.62% |  | 2.40% |  | 2.20%
Expected annual dividend yield |  | — |  | — |  | — |  | — |  | —
Expected volatility |  | 75.61% |  | 70.29% |  | 63.66% |  | 67.40% |  | 65.86%
Term (years) |  | 0.62 |  | 0.87 |  | 1.12 |  | 1.37 |  | 1.62
Fair value |  | $4.6 million |  | $3.6 million |  | $1.3 million |  | $1.6 million |  | $1.1 million

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