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Note 14 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 24, 2021 | Mar. 22, 2021 | Mar. 05, 2020
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  | $ 0.01
Proceeds from Issuance of Common Stock |  |  | $ 14,767 | $ 19,395 |  |  |
July 2020 ATM Offering [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 1,099,021 |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  | $ 11,200 |  |  |  |  |
Proceeds from Issuance of Common Stock |  | $ 10,800 |  |  |  |  |
Subsequent Event [Member] | July 2020 ATM Offering [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 1,368,362 |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross | $ 15,200 |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 14,900 |  |  |  |  |  |
2017 Warrants [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  | 362,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  | $ 6.75
2017 Warrants [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 362,500 | 362,500 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 0.01 |  |

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